Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4f28a4b11e3a6a…

MALICIOUS

PDF

60.3 KB Created: 2020-12-03 13:29:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e3e6fda60988ef3699584cd7049aa4aa SHA-1: 76248fadef51a91bc083c1574d9a717df4359ae4 SHA-256: 6e4f28a4b11e3a6af7b46a25c0ea849bf205718e5f26bbfc5b000967f0997c09
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spamming operation. The primary URL, 'https://trafffi.ru/strik?utm_term=samsung+tw-j5500+best+buy', suggests a lure to a potentially malicious site disguised as a shopping result. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the phishing and malicious link farm assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://trafffi.ru/strik?utm_term=samsung+tw-j5500+best+buy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446161/normal_5fb438415aec7.pdfIn PDF document text
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/570348.pdfIn PDF document text
    • https://belafawejogawol.weebly.com/uploads/1/3/4/5/134583754/jakadaworulozazur.pdfIn PDF document text
    • https://tupipukevoluda.weebly.com/uploads/1/3/4/0/134041298/4909297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417122/normal_5f99cfa358930.pdfIn PDF document text
    • https://fupesovuzej.weebly.com/uploads/1/3/4/0/134016868/8177651.pdfIn PDF document text
    • https://logozirajukafod.weebly.com/uploads/1/3/4/8/134848231/pofafa_vowomawezut_gabapepunoje_wimutebarud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdef173570fb44d1c80b1f/1606283031426/survival_craft_2_apk_no_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/5e_trade_goods.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/cbse_12th_date_sheet_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/pathogenic_microorganisms.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_off0000af04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF04 5688 bytes
SHA-256: 7f1be871c7b1954cb1a61dbf8dbf722729ec562cfbbb77244b64958df615bc74
font_01_sfnt_off0000c272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC272 10196 bytes
SHA-256: 845e0cde5545aa2552f6a3cf80c01631e757b6d760a459e6a92b8183f27ff63d

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