Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f4f6d46dfcec66…

MALICIOUS

PDF

70.8 KB Created: 2021-04-09 23:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 67b4fa3a57253a8ed43b5c912741f2e7 SHA-1: cfc14a1e78d92f6e2e33434bf35c7f6a731ba5a1 SHA-256: 28f4f6d46dfcec66e0aeb0ccf431037026e8129d3454f4532f4a5a0c713f4d86
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to obfuscate the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://vilenefex.ru/strik?utm_term=acer+aspire+c24+keyboard+not+working PDF link annotation
    • http://pazujiz.mygamesonline.org/does_fairy_tales_lice_prevention_work.pdfIn PDF document text
    • http://davegopodowog.iblogger.org/latiluliwomizorofugow.pdfIn PDF document text
    • http://wubosilafusim.iblogger.org/lemafumemigujuwemuvid.pdfIn PDF document text
    • http://lojisaka.22web.org/drawing_lewis_structures_practice_worksheet.pdfIn PDF document text
    • http://rifivejawix.22web.org/biochemistry_books_satyanarayana_free_download.pdfIn PDF document text
    • http://xurunoxawes.iblogger.org/30326965958.pdfIn PDF document text
    • http://vosajizegek.mypressonline.com/boy_scout_of_the_philippines_handbook.pdfIn PDF document text
    • http://vefuxeromuriwir.iblogger.org/automorphic_forms_and_even_unimodular_lattices.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/7378ca07-c9ac-470a-bae2-3373f20ec034/jexalet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c27129e-dd11-4c14-9fed-02a2f9d0b212/percy_jackson_and_the_olympians_books_free_download.pdfIn PDF document text
    • http://tezadoni.rf.gd/fidafafa.pdfIn PDF document text
    • http://dogipozonuxa.epizy.com/xivekubixelugofevuj.pdfIn PDF document text
    • http://temomuduzuba.epizy.com/kdigo_guidelines_ckd_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baae24d8-925c-4ecb-9eee-0a2342cd642f/boss_ls-2_line_selector_pedal_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeb02e56-bb0f-460a-b2f0-34c946cd5952/kelek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8adcc213-fd8b-4ef6-8876-d2214e2e8a6d/guguzomelaxuxuzarud.pdfIn PDF document text
    • http://xesidif.epizy.com/51516105979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a44f175e-de88-4f6c-9cca-1f23bd2e2bfa/jenewojepevenusuxugasada.pdfIn PDF document text
    • http://jutejuviwolopis.rf.gd/difference_between_heterochromatin_and_euchromatin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abb7b1f8-cdbf-4e27-9f52-3405e0968727/31047739198.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD536 5816 bytes
SHA-256: c13d5ef6df9d694588f51d57cb0cbc64e720ddd6aff109b518246e25c292bf3d
font_01_sfnt_off0000e939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 10816 bytes
SHA-256: efedafb2630e27658df7d74f045cade1f581b57908c49ef75d3bb2a7d20ac0ef

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