Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad37aa214853be9c…

MALICIOUS

PDF

67.8 KB Created: 2021-02-13 09:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7d16869ee7cd5c88f4db85fe34585480 SHA-1: 72a60c3757319215252f037ea696711ebfaf1bc5 SHA-256: ad37aa214853be9c90ca4fe73868111b115c63aa437bb7e1130e2d7535e4ee7a
226 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SUSPICIOUS_LINK_LURE' strongly suggest malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a dropper for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/aws?utm_term=anatomy+directional+term+worksheet PDF link annotation
    • http://fragcups.com/sample_project_management_closeout_reportqbmln.pdfIn PDF document text
    • https://witabavuwimob.weebly.com/uploads/1/3/4/3/134339013/3478973.pdfIn PDF document text
    • http://atomlinux.com/heathkit_tc3_manual64hvw.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/jjetSic/23365814303.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/zamogonawokuxeky3bwn.pdfIn PDF document text
    • http://kelnoteres.xyz/gisanobekidubibinufumolifyu5uv.pdfIn PDF document text
    • https://cdn.sqhk.co/tulazofava/fMig8hh/ps4_tool_kit_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelemusib/ihjgihB/gulobunivenujur.pdfIn PDF document text
    • https://cdn.sqhk.co/lirebirab/iiFxOuY/vuzajomomanefimodiragorex.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/dYiavj9/50421897815.pdfIn PDF document text
    • https://cdn.sqhk.co/setewefasari/3giGXjf/63087080092.pdfIn PDF document text
    • https://cdn.sqhk.co/fibafape/jaVxicj/nickelodeon_resort_punta_cana.pdfIn PDF document text
    • http://shoop-fk.ru/41197361774ztkar.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/jiierTJ/13313792850.pdfIn PDF document text
    • http://fruit-citrus.space/how_to_combines_into_one_file_macxq3ar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2C 5424 bytes
SHA-256: 27e59aa45075c1abba3e51766893ad40e756800932dff3d8af4acf18be5c40a1
font_01_sfnt_off0000df8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8B 10264 bytes
SHA-256: 7fcbd935019c22880659bed1a25abd458c6eb06bde4c4f94fb8dd36751b0262c

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