Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fce2f8f218a8d5e…

MALICIOUS

PDF

74.5 KB Created: 2021-05-05 11:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8f55116cb183e446bfd055d418246d26 SHA-1: 2a74a60cce2301a027bd2c118108676b71bac14d SHA-256: 1fce2f8f218a8d5ef18c6fe636a49c854638ab28245aa07ba688e1fbe481bbff
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing. The embedded URLs and the document's structure are consistent with attempts to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/strik?utm_term=how+to+repair+windows+xp+with+cd PDF link annotation
    • https://fojaxekixuwid.weebly.com/uploads/1/3/4/7/134743661/8730698.pdfIn PDF document text
    • http://zuvels.xyz/nodutugi4st15.pdfIn PDF document text
    • http://acupofjacob.com/axial_scx10_ii_rtr_vs_kit9q3wz.pdfIn PDF document text
    • https://cdn.sqhk.co/putomikoluku/ig5e8Oy/cn_superstar_soccer_goal_mod_apk_latest_version.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/vimuniz.pdfIn PDF document text
    • https://lozibojugor.weebly.com/uploads/1/3/1/0/131069840/fe9a3e28.pdfIn PDF document text
    • https://bobidowi.weebly.com/uploads/1/3/2/7/132740787/d5f9b.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/hggFdhf/idle_success_no_ads.pdfIn PDF document text
    • https://cdn.sqhk.co/niporatibu/ej2x2y5/mediaf_re_minecraft_addons.pdfIn PDF document text
    • https://jagedebake.weebly.com/uploads/1/3/0/7/130738918/zonurosadub.pdfIn PDF document text
    • https://tusujowifavenag.weebly.com/uploads/1/3/1/4/131453847/zawifo.pdfIn PDF document text
    • https://kitipodowenin.weebly.com/uploads/1/3/5/3/135383326/5e6e23.pdfIn PDF document text
    • https://cdn.sqhk.co/kidurukazag/fJxgige/47129623480.pdfIn PDF document text
    • http://mixed-rootwork.com/direct_and_indirect_reported_speech_lesson_plan4lqei.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/ghbjada/stadia_free_trial_youtube_premium.pdfIn PDF document text
    • https://galojonebe.weebly.com/uploads/1/3/4/3/134353990/ruxubuwepeguzotep.pdfIn PDF document text
    • https://vejilete.weebly.com/uploads/1/3/5/3/135312445/3281435.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_f0500aaccdc54185a529c524e467f5c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/lufisabaxegajimepo.pdfIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_c1eb88fa58b749a5b604a07f418a560b.pdf?index=trueIn PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_958367258c35455698010b8408d68546.pdf?index=trueIn PDF document text
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_078ba2855df54beb8b5960cb111eeff8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/30616058510.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/marvel_heroes_2016_free.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_off0000e674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE674 5248 bytes
SHA-256: fd572c057e970ea582f73a7db4f21b8f635f3a081d488d742096e2b9a0c93b61
font_01_sfnt_off0000f858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 10616 bytes
SHA-256: 533fbc90402018413b8146278eb6d3e035b0ebdcb24162620e9845aa53261378