Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61f6d0039092763…

MALICIOUS

PDF

83.1 KB Created: 2021-03-28 00:18:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c7b3ad1d0496b80569f8207dd99c8e64 SHA-1: fff2a20ddedb1a15026f8a1f6ea36edf97d00009 SHA-256: f61f6d003909276358d55c556fb7387d20fac1c8175c3f01ff983e5b79737eb9
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirector infrastructure, indicating a link farm designed to lead users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to malicious content, likely via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/123?utm_term=bts+love+yourself+answer+concept+photos+theory In PDF document text
    • https://rajevolid.weebly.com/uploads/1/3/0/8/130813967/tewed.pdfIn PDF document text
    • https://femadupimasimu.weebly.com/uploads/1/3/4/5/134594559/tagizosepusuma.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/15380520711.pdfIn PDF document text
    • https://karimimeri.weebly.com/uploads/1/3/1/1/131164281/9340453.pdfIn PDF document text
    • https://metifipiwe.weebly.com/uploads/1/3/1/1/131164131/7249421.pdfIn PDF document text
    • http://tebogekememesij.mygamesonline.org/17525360875.pdfIn PDF document text
    • https://zejewovelopitut.weebly.com/uploads/1/3/0/8/130813539/c8ccfae06d8a598.pdfIn PDF document text
    • https://zatikavetix.weebly.com/uploads/1/3/2/3/132303242/4359321.pdfIn PDF document text
    • http://biwedujurar.mywebcommunity.org/strong_bible_dictionary.pdfIn PDF document text
    • http://kapabifidi.sportsontheweb.net/69486835834.pdfIn PDF document text
    • https://kuwepokipeluzil.weebly.com/uploads/1/3/0/9/130969114/ad1e162afd30.pdfIn PDF document text
    • https://pupazugosabi.weebly.com/uploads/1/3/4/8/134868946/c4fa11cab4.pdfIn PDF document text
    • https://pirovosarelivo.weebly.com/uploads/1/3/1/4/131406751/korefovajazojakore.pdfIn PDF document text
    • https://seruliwosudaz.weebly.com/uploads/1/3/4/4/134457931/aa182a39f09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5500ca5-5371-4cc3-96c2-5bb10983e908/celestron_powerseeker_70az_parts.pdfIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_a6e5bb6f39c247fe83eac04e21d770c2.pdf?index=trueIn PDF document text
    • http://rukosivujuxu.atwebpages.com/mathematics_books_for_class_2.pdfIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_ace5806abc0846bf871cada6fecc151e.pdf?index=trueIn PDF document text
    • https://5f1c1209-45f6-45c0-988a-e0aaa04be055.filesusr.com/ugd/ba5820_20ad1e2c1cdb4367925c852d8cd370ca.pdf?index=trueIn PDF document text
    • http://tavamikilav.myartsonline.com/al_quran_bangla_mormobani_apps.pdfIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_efc987382b444ed9b0a2971633b1c7f0.pdf?index=trueIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/punofadejoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f6246f-9c4f-4323-923c-648c97425d2a/57719193301.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_546db46af8124f8db28735990f43d311.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f685f47c-23ae-45d0-8682-a0858b3bb3d0/what_is_the_difference_between_ergobaby_360_and_omni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f28c0c8-81df-4c93-9c8c-1eb2236ed45d/where_to_find_amelia_bedelia_books.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 3672 bytes
SHA-256: 7cbcf0de5f7e2b845add067af6eb378c900d2b76b2cf1ba10190d2f06e1e81c0
font_01_sfnt_off000103fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FE 5404 bytes
SHA-256: 5f4a608ade9757f84480a602b15e117b1f529c21e55eef8b24a12a292bbd2bf1
font_02_sfnt_off0001167d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167D 11084 bytes
SHA-256: 1c67edd0363aeaf26d219a8dd2ac9577c8a0c54c6d766de1d77f3e7a8980791a

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