Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63b8d7a09f119a4…

MALICIOUS

PDF

78.2 KB Created: 2021-02-05 11:10:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8045385002b618ee1b51fa2c64c949f0 SHA-1: 7ec9dd33499608a25e7ed1bde49d2fc5da081c28 SHA-256: f63b8d7a09f119a447c53e8f15b25db4cd759fe3b8b518a987cb5c08917b2358
194 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' confirm the attack pattern of directing users to potentially harmful external sites. No scripts were extracted, but the overall structure points to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=fedex+ground+fayetteville+nc PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426701/normal_600915722bf15.pdfIn PDF document text
    • https://bukodagunotul.weebly.com/uploads/1/3/4/0/134012399/welarupuv.pdfIn PDF document text
    • https://volilisaxox.weebly.com/uploads/1/3/1/4/131453747/lifixizibizijeza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445130/normal_5fd98609248db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470221/normal_5fec04704c162.pdfIn PDF document text
    • https://xolijusir.weebly.com/uploads/1/3/4/0/134016651/retas_soguvawuz_bavofegapevoro.pdfIn PDF document text
    • https://figapizezedop.weebly.com/uploads/1/3/4/3/134364787/ee5bdc8b2034.pdfIn PDF document text
    • https://tulitexuson.weebly.com/uploads/1/3/1/6/131636586/zokafulelutulumalo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448556/normal_601994e03d9fe.pdfIn PDF document text
    • https://xokizaneg.weebly.com/uploads/1/3/4/8/134886830/wogurirotaxewop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413345/normal_5ffba275cb1b2.pdfIn PDF document text
    • https://nurerimufiwovu.weebly.com/uploads/1/3/4/3/134394752/lowavagazima.pdfIn PDF document text
    • https://nokaxogu.weebly.com/uploads/1/3/4/5/134520383/e50b64.pdfIn PDF document text
    • https://xorizugabe.weebly.com/uploads/1/3/1/3/131398100/zelubilosiromufite.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391013/normal_5fe4d4590350f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465702/normal_5fd7e9b287c7e.pdfIn PDF document text
    • https://nisazixipa.weebly.com/uploads/1/3/0/7/130775104/paxeparibawaka.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/fewifuwu/buzoterawajel.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/clevedon_school_uniform_protest.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/formule_brute_du_bicarbonate_de_sodium.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE981 2880 bytes
SHA-256: 619a44e8b5c2a2d3fc0e18259d8022938ad4f8b30552901bc68dc41c3d0f2ef0
font_01_sfnt_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 5196 bytes
SHA-256: d95158e50f3cdca47e1329aadbdb7ca8b14ee81ed51bf83fd242c54a0345a17b
font_02_sfnt_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 10908 bytes
SHA-256: 749650f467506b1e7d1378ac40afd29f21cb812c6ff7d2bac11e7e4c194b8e1e