Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2dd1e05b8a9df1a…

MALICIOUS

PDF

66.4 KB Created: 2020-12-10 16:34:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: eb9e7bfb5b8eefe07f1332801da67507 SHA-1: df90eb9d5653643cf42b62a9476ba10b70ceb965 SHA-256: b2dd1e05b8a9df1a41dd1b757115d9ebe89819c71b44705a8febdd7c5e781715
186 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, many pointing to disposable hosting services like Weebly. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier output confirm its malicious nature, likely as a phishing or trojan delivery mechanism. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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://trafficel.ru/aws?utm_term=axios+post+data+form PDF link annotation
    • https://lazaxakekobopox.weebly.com/uploads/1/3/4/8/134878873/dumumiwoje.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/5030407.pdfIn PDF document text
    • https://gubaxefu.weebly.com/uploads/1/3/4/5/134592394/2723851.pdfIn PDF document text
    • https://naxulukituno.weebly.com/uploads/1/3/4/8/134879135/veduxifo.pdfIn PDF document text
    • https://pegepefip.weebly.com/uploads/1/3/4/4/134455730/fanorew.pdfIn PDF document text
    • https://mumamelif.weebly.com/uploads/1/3/4/4/134464597/7466227.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/salade/12218927595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87bd24e4-1c68-4aed-9585-aef1bebed0ae/causes_of_bullying_in_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50840d59-4c6d-4466-8775-d3493d491218/ejemplos_de_resume_en_espanol_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/how_do_chemosynthetic_organisms_form_symbiotic_relationships.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/1285887521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea064219-56b0-403a-a0f5-398e98f874cb/dakuvetonefune.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_off0000c1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E2 5212 bytes
SHA-256: 59520ac6dfb9598393b91c8039a0ab9a46ee7a197df823846b3e65c167ff9efc
font_01_sfnt_off0000d391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD391 12388 bytes
SHA-256: 297001741c313b69d0aa4a432305a6e1b57b295dedb1b03b8adce3bc07e45f17

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