Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f27ee40cb38fa1c…

MALICIOUS

PDF

70.7 KB Created: 2021-04-04 10:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a4f2c92e66b1be1e132dcdea66a493c SHA-1: 20d310849fc0f60b0fa8a98f161193afdb1f90cd SHA-256: 5f27ee40cb38fa1cc6c291a972aa57a83ce58fafb7273857ec0a640bac0fdbf8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The primary URL suggests a lure related to search results for 'forensics on trial worksheet answers'. While no scripts were explicitly extracted, the PDF structure and extensive URL usage indicate a phishing or content-distribution attempt, likely involving JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=forensics+on+trial+worksheet+answers
    • https://cdn-cms.f-static.net/uploads/4477387/normal_6035d9b1e8267.pdf
    • https://cdn.sqhk.co/piredonina/jdhfhgv/labupexuz.pdf
    • https://cdn.sqhk.co/buzusodova/Dhckmhd/real_cricket_20_ipl_auction_unlock.pdf
    • https://cdn.sqhk.co/geroterunetu/zWyhjhf/gavotojadezebigewog.pdf
    • http://iciapp.xyz/gutewefikj5xda.pdf
    • https://cdn-cms.f-static.net/uploads/4377414/normal_6068ad9a77808.pdf
    • https://cdn-cms.f-static.net/uploads/4374847/normal_5fd7b71ee53f6.pdf
    • https://cdn-cms.f-static.net/uploads/4392209/normal_601a1b91184fa.pdf
    • https://static.s123-cdn-static.com/uploads/4485807/normal_5fe0d97a121e2.pdf
    • https://cdn-cms.f-static.net/uploads/4369189/normal_60417f65e8675.pdf
    • http://ceter.xyz/as_bill_sees_it_daily_readingjgcqx.pdf
    • https://cdn-cms.f-static.net/uploads/4490529/normal_603fdec510c76.pdf
    • https://cdn-cms.f-static.net/uploads/4384323/normal_6037df3471fe8.pdf
    • https://cdn.sqhk.co/vufebevefo/iigcflT/origami_butterfly_ball.pdf
    • https://cdn-cms.f-static.net/uploads/4367903/normal_60240022c8869.pdf
    • https://cdn-cms.f-static.net/uploads/4365638/normal_606824e62c68b.pdf
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdf
    • http://reetodo.online/classical_trumpet_solos2k5qy.pdf
    • http://teasmall.space/bavowidovukovegovixabetixcb34e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2df7536a-ab64-4dd3-a6ca-98e0eca144a4.filesusr.com/ugd/de578f_8eb729eae32449159208349a41f18fc5.pdf?index=true
    • https://cc4f1b1a-08c7-467e-bb5a-e3073ad8caf1.filesusr.com/ugd/ffc175_715f7025df4148c89f7c75ad78745ec3.pdf?index=true
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_7d937fd363c84356be38d1331fc0c228.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d641.bin
14cc6271df403c65d5ee20ee572b1763c0d29e9b046fe64660fb9f11e49fed67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD641 5000 bytes
font_01_sfnt_off0000e74f.bin
1ebc6c19996e79534cc396b65536f8d71e156599a5d5e03b6b381f30efd14432		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 10784 bytes

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