Malicious PDF — malware analysis report

Static analysis result for SHA-256 556fcd8472ca9b41…

MALICIOUS

PDF

64.0 KB Created: 2021-02-25 20:17:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9aa8164f63d051d258647bf8c6d2888f SHA-1: e22977742ae57ea268f5eb0d86e4ec9f38a820df SHA-256: 556fcd8472ca9b4143219c45d4edf3d348e32e0d1744ea1e2657c35dd7e37f20
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The heuristic 'SE_LOLBIN_RUN_COMMAND' firing with 'curl_products_on_straight_hair.pdf http://' suggests an attempt to execute commands or download content, likely to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9736

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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
  • 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://baarspo.ru/award?keyword=sylvia+day+crossfire+series+four+book+collection PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4372980/normal_5fc60356cfff9.pdfIn PDF document text
    • http://outputqwvk.space/32519185125zjsh3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409997/normal_600b3ddb1636a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386349/normal_5fea06b95b47e.pdfIn PDF document text
    • http://sokadap.22web.org/netnaija_action_movies_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380695/normal_5ff6d09637cc1.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/ggigdhi/read_comics_online_dceased_unkillables.pdfIn PDF document text
    • http://metalllift.ru/56408031699dutnl.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/kofopedobawe.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/nijgjjw/80045696859.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/zobalutevesumuserukeru.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/can_i_use_curl_products_on_straight_hair.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/32725507737.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rosotuliguxajo.rf.gd/marlin_80_dl_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/berberine_or_metformin.pdfIn PDF document text
    • http://wuniwivufe.rf.gd/wifejan.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 5368 bytes
SHA-256: 2511edfc507ecf2d32625385ea877965e8afc1d938319289223dc9771dbc19c4

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