Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd9d0b768e9f7b2…

MALICIOUS

PDF

92.4 KB Created: 2021-03-29 16:38:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a91c6c536302778506a69d954d0b8285 SHA-1: 9fd2b40799077b1337464a6e92f3ea3782e3f6d3 SHA-256: 7fd9d0b768e9f7b23ccdc1f81628d0434efcd76bed779b9190f6181b73e6b5bf
186 Risk Score

Malware Insights

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

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 0.9997

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
  • 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://leonvi.ru/123?utm_term=breaking+window+sound+effect+free PDF link annotation
    • http://erogancolumbia.site/204743011584fkrf.pdfIn PDF document text
    • https://cdn.sqhk.co/vujejanar/Qic4Sig/stylish_urdu_fonts_ttf_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/jfKScgh/macmillan_education_students_books_answers.pdfIn PDF document text
    • https://ranekiwoj.weebly.com/uploads/1/3/0/8/130814960/ginovofogiruz_gelixozajated.pdfIn PDF document text
    • https://faporipito.weebly.com/uploads/1/3/4/6/134600592/zazaf.pdfIn PDF document text
    • http://sale50.pro/html_css_jobs_for_freshers_in_bangalore2cq5m.pdfIn PDF document text
    • https://cdn.sqhk.co/vunebegawiwa/iF9Krii/download_game_rally_racer_drift_mod.pdfIn PDF document text
    • https://kominuxopexazi.weebly.com/uploads/1/3/0/8/130814675/0caee3161c0a.pdfIn PDF document text
    • http://xupazekawinan.iblogger.org/73698989583.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_6e537636871d4c69acee519d20da25a7.pdf?index=trueIn PDF document text
    • http://lidizuderezoza.rf.gd/typhoid_fever_2018.pdfIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_a558a871a57f47b8a4146cf33ef9fd45.pdf?index=trueIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_c089c4ccf16545fb9cbaabc6c861ea5a.pdf?index=trueIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_bf80f283b7aa40e3b80c2b9b5e825b80.pdf?index=trueIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_1ac2fa1056ac4270a03205c55607efc6.pdf?index=trueIn PDF document text
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_91bc8128e11d4383953b662eeefe19c3.pdf?index=trueIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_2e727fcd71714b3bbc372e592e687bda.pdf?index=trueIn PDF document text
    • http://setiwifuv.rf.gd/adobe_air_reader.pdfIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_6409547de9a74c7895303acd9d201e00.pdf?index=trueIn PDF document text
    • https://411563d6-f1a1-4768-9eaa-86e4eb1f1ae3.filesusr.com/ugd/6d8349_eb66a3a188fc48bd9dd98198ceabc3ae.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFC 5360 bytes
SHA-256: 50f93aa47b5cde2bfa4f94a2fc76166d5a0fb3812d3dc5366ad9635f57f4b516
font_01_sfnt_off00013e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E65 11024 bytes
SHA-256: cafa4ca74d25793dc37f44ace0ea0c6cbf8adfea7c7d08d0f076d639fbffe4c0

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