Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6afc52848ac839e…

MALICIOUS

PDF

74.2 KB Created: 2021-02-15 20:59:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b8b811f273751dfa09e582a57bce70bd SHA-1: 910573c306597df7b8c85a4744688cb53760aa17 SHA-256: c6afc52848ac839e63ab9dc0636a00bb8b398a8fe9c7970d53eda7cb6613ea46
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The primary URL points to a resource that appears to be related to salary information, likely a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO spam. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://jacksth.ru/123?utm_term=how+much+do+apple+hardware+engineers+make PDF link annotation
    • http://filfex.ru/all_functions_in_python9n44w.pdfIn PDF document text
    • https://dikemogegopur.weebly.com/uploads/1/3/1/4/131406608/dunafarag-fisazorido.pdfIn PDF document text
    • https://kesizibewasi.weebly.com/uploads/1/3/0/8/130813921/432fc5.pdfIn PDF document text
    • https://tafopolen.weebly.com/uploads/1/3/4/3/134396822/d9957.pdfIn PDF document text
    • https://sisuveraxom.weebly.com/uploads/1/3/2/7/132740665/jikofabipelufi_vifazanajew_wakibinimezepa_jikajowona.pdfIn PDF document text
    • https://dumidonawusirug.weebly.com/uploads/1/3/5/3/135306770/zafamosur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452853/normal_5fd957ed6ade6.pdfIn PDF document text
    • https://nonesuwenuvav.weebly.com/uploads/1/3/4/4/134400251/8416756.pdfIn PDF document text
    • https://xikofekukinakij.weebly.com/uploads/1/3/2/6/132681309/1b05dde258.pdfIn PDF document text
    • http://kuvofejom.iblogger.org/92177437329.pdfIn PDF document text
    • http://yesnutural.space/gedebanoxujultm740.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ragidunu.rf.gd/segowedigej.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/jilisudoj.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/anti_stress_music.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/notoser.pdfIn PDF document text
    • http://nonidimujosapa.epizy.com/ruzeligamafe.pdfIn PDF document text
    • http://sinodigewenewe.rf.gd/xixubaliremib.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_off0000e376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE376 5604 bytes
SHA-256: 90730c665eec4860959bbeccd255dcf6d9decd767bcdb763830615e512657f94
font_01_sfnt_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 10964 bytes
SHA-256: 454527afee4a861c15ad787c500af263bc4ded5836736270ed2c38fa0cee1eec

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