Malicious PDF — malware analysis report

Static analysis result for SHA-256 b32bb04af6b21da3…

MALICIOUS

PDF

80.9 KB Created: 2021-04-13 11:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 289c2a393f012ee5d11a53406c2b1a04 SHA-1: 457bb9ec7b8128c83295c790d0769f8a22243977 SHA-256: b32bb04af6b21da31c2c82df2813bd917a4f1ec481070320363fceaecb081086
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. The document body is largely unreadable, but the presence of numerous external links points to a content-delivery or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=words+to+describe+something+rainbows PDF link annotation
    • http://testrun.ru/48997355847xt3fw.pdfIn PDF document text
    • http://constructionhouse.info/647727217795rp5y.pdfIn PDF document text
    • https://cdn.sqhk.co/gugapedulob/hchg8hg/infinite_painter_pro_apk_download.pdfIn PDF document text
    • http://myfoxing.online/arithmetic_worksheets_year_7evyth.pdfIn PDF document text
    • https://cdn.sqhk.co/sugezigo/gCfXuhd/48875622373.pdfIn PDF document text
    • https://podosutopo.weebly.com/uploads/1/3/4/5/134590637/9523955.pdfIn PDF document text
    • https://cdn.sqhk.co/xakalodesi/vXgfeou/mamorejuxiwikekepexalenu.pdfIn PDF document text
    • http://igonlinesupport.com/galijegadulukisikuzyjx6.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/gfhjiyg/thrifty_shopper_ithaca.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/xTkibhj/smith_s_food_and_drug_sandy_utah.pdfIn PDF document text
    • https://rimofemosi.weebly.com/uploads/1/3/4/3/134351632/zowinutig.pdfIn PDF document text
    • http://begetus11ppz.xyz/blue_and_silver_balloons_background6bwc3.pdfIn PDF document text
    • https://motuzepiruwilo.weebly.com/uploads/1/3/4/3/134348631/3269098.pdfIn PDF document text
    • https://cdn.sqhk.co/bujavenizake/0j7heQ5/52425371696.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://s3.amazonaws.com/wobuzisibal/what_is_the_formula_for_average_power.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/executive_decision_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/95948472899.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/morokuwejefojaketusok.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 5356 bytes
SHA-256: 363ebeddc0c319a24a0d4611fca647777d1fac164d2d16663f5cc5f3af5b515d
font_01_sfnt_off0001025d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025D 11108 bytes
SHA-256: dd69f59c7e3f35026c82699bdd9428923905abf382c989ae5382fc5dd9616bf3
font_02_sfnt_off000127e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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