Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca3cc6cd86b5ff9…

MALICIOUS

PDF

95.7 KB Created: 2021-02-16 19:32:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30a4dadd465c09cd110659e7a0fc0425 SHA-1: c76cabe6d818daeb7283f3728ccf56ef6d86b1cd SHA-256: fca3cc6cd86b5ff9d71ed424d978efd39ac1890a77e443a77d31efeeed645472
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on suspicious domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=which+is+the+best+vacuum+dyson+or+shark
    • http://autoupgrade.website/lokonunali5u0va.pdf
    • https://cdn.sqhk.co/lojulifuvuxu/gm1GFHb/pizuxamojetipejovomo.pdf
    • https://static.s123-cdn-static.com/uploads/4476577/normal_5fcdfd2a44472.pdf
    • https://cdn.sqhk.co/wemorapi/Ehhhcih/34686780876.pdf
    • https://cdn.sqhk.co/vozofugova/dOicjdp/38426669296.pdf
    • https://static.s123-cdn-static.com/uploads/4369514/normal_60011e054fbb5.pdf
    • https://babanude.weebly.com/uploads/1/3/4/0/134017813/zovodokamovewa_nuwutam_vejavulovogepa.pdf
    • https://cdn.sqhk.co/laripikiwafo/hdEifjd/najane.pdf
    • https://static.s123-cdn-static.com/uploads/4416332/normal_5ffc1553867ce.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dinigugaxej/adventure_league_faction_guide.pdf
    • https://s3.amazonaws.com/xewamejixolefaj/mbbs_full_form_funny.pdf
    • https://s3.amazonaws.com/rivazixexuguri/wt_bellochero_font_free.pdf
    • https://s3.amazonaws.com/jidosatikim/14th_finance_commission_guidelines_odisha.pdf
    • https://s3.amazonaws.com/gonafoziguwewe/email_address_format_validation_rules.pdf
    • https://s3.amazonaws.com/sedowedi/steps_of_artificial_insemination_in_cattle.pdf
    • https://s3.amazonaws.com/doxifuba/bacteria_classification.pdf
    • 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_off0001398a.bin
8d0fa9129647fe6eac2648a758173d1ed7ca0b8bddde237102ec47894fd7365b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1398A 5524 bytes
font_01_sfnt_off00014c39.bin
133842e912ce5fafba4c634eedf659f5d3cfcaac9c0a5dfcc846c7509f898deb
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C39 10956 bytes