Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a395675ce33bc5…

MALICIOUS

PDF

116.5 KB Created: 2021-03-27 11:42:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a0c55265b6e246a70fb1ddde11fa88ac SHA-1: 70133aa29430770acccc640921a7c06dcbd3cde1 SHA-256: 79a395675ce33bc5c41b6db611feb5e3acfea2962e322bf4d829f33ec828d85e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dugedepap.ru/wix?keyword=chinese+radicals+worksheet PDF link annotation
    • http://kitixukizogutik.mygamesonline.org/ragizovaropa.pdfIn PDF document text
    • http://wikowezenitezo.medianewsonline.com/5079944840.pdfIn PDF document text
    • http://goodnatural.space/68586218854hqdxr.pdfIn PDF document text
    • http://lerob.info/juwivawesimedakipozuronae5lkj.pdfIn PDF document text
    • http://servempieza.site/93459605585bjom7.pdfIn PDF document text
    • http://kraftmann.su/39829938430bxh0m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416669/normal_5fcfa0b5c76e7.pdfIn PDF document text
    • http://suporefebakibur.mygamesonline.org/ansi_c_balaguruswamy_download_free.pdfIn PDF document text
    • http://hotloveme.online/6064433931ie79e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_600a86ae6382e.pdfIn PDF document text
    • http://silvanozito.online/jevapidogumuzujis6lpa.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/326640f8-e380-421c-a832-86a6192d4cc8/auto_electrical_courses_in_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/588c488a-9919-44df-9599-cad538a402a6/toxed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf49e489-cfa2-49d9-b6ca-a1bb358aec2a/munolujeveziwig.pdfIn PDF document text
    • https://8ea4a4fb-2859-49e6-8c89-66ed49166bb4.filesusr.com/ugd/0088c1_cb046cc2ddce4b80963056a731513212.pdf?index=trueIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_35b564c9c4e74ed093e59d201be56a42.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001015f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 40408 bytes
SHA-256: e9e3b0239aedf4a68b2691c87824af307376f54aacc6bbe929346d2cb5d71ed1
font_01_sfnt_off00017e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E27 4992 bytes
SHA-256: 2c9af2fe1b102c854d4dcc1d362cc16e487471efb1dd2ccaf561d49554409256
font_02_sfnt_off00018f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F1B 11656 bytes
SHA-256: 54cf93aaa468b669067619806197c8456cbefd969421ed86583abc68b4ef1462
font_03_sfnt_off0001b646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B646 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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