Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a0d2a60b39b887d…

MALICIOUS

PDF

80.2 KB Created: 2021-03-08 08:33:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9286fc42b779708dcaba53de2252f4d5 SHA-1: 2ef25ccc27e06eafe31e67057af97dea8270ab46 SHA-256: 0a0d2a60b39b887def8c0b1335e0414044e6c6eb3606c20ccca5dfc8a13ea3c1
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 are dynamically generated, indicating a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://leonvi.ru/strik?utm_term=precalculus+textbook+mcgraw+hill+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451348/normal_5fc7a14a7cf32.pdfIn PDF document text
    • https://zudezujom.weebly.com/uploads/1/3/1/3/131384555/5030662.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/GKfghg4/70818811741.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403940/normal_60044d182c6af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465277/normal_5fcc8b9022a2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446647/normal_6045883f66ec0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470040/normal_60088c3498278.pdfIn PDF document text
    • https://mizilugodipibo.weebly.com/uploads/1/3/0/8/130813887/witojujubakur_supabenigo_kegurijuxoraw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501484/normal_600654ba086e8.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/PhahaNd/vulatobetofizofaluk.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/PYiegvF/ditoserap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416934/normal_5fe03a508e665.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372371/normal_5feba5fd67bd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455208/normal_5febfee3d8379.pdfIn PDF document text
    • https://cdn.sqhk.co/zigotimuti/D1hhN67/die_together_new_politics_lyrics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377697/normal_6043083a3fb47.pdfIn PDF document text
    • https://zurudepovog.weebly.com/uploads/1/3/1/4/131438860/vopojewexe-jegoxizarizulak-pukow-vokudunudivevid.pdfIn PDF document text
    • https://mezowizutu.weebly.com/uploads/1/3/4/8/134898125/6979400.pdfIn PDF document text
    • https://kazuvamelu.weebly.com/uploads/1/3/0/7/130738637/1488747.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a228be72-016c-4330-b976-99824308d38e/volume_price_analysis_anna_coulling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dfee63e-ac2f-41df-a588-b69efb2795e1/25558721855.pdfIn PDF document text
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_8841942dfc27437895d188e560147d0a.pdf?index=trueIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_ca20c5ef647b4f619049078de0878c8c.pdf?index=trueIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_efdf1bb8bd8a4a288a72e1704830d3c0.pdf?index=trueIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_5232ca81e387426c8fbbe0de48fa0fe0.pdf?index=trueIn 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_off0000f926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF926 5580 bytes
SHA-256: 44047ceef821601efa3cf8ac4b389301eed52e4fbe7c4dd09b0f9ca87157a32c
font_01_sfnt_off00010c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0E 11512 bytes
SHA-256: 63e60cabea6978241ef80ae8c5689e484a9aeef853e1dc47dbbb3afbd6b56dfb