Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f63910def0229be…

MALICIOUS

PDF

76.9 KB Created: 2021-06-09 21:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 00da74292d3b0942206d0e669b99d0d3 SHA-1: 48e7da5cf92eb99766f456f8a3734ba0df95502e SHA-256: 8f63910def0229bea9ddd2bb8eed68cbd7b56151d561e9a556006161e5794397
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded URLs and the structure of the PDF point towards an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/123?utm_term=anjali+telugu+video+songs PDF link annotation
    • https://kigadipokifexi.weebly.com/uploads/1/3/0/8/130813079/memaziguguti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457620/normal_6032386eb79b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_60220dd1aa464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452621/normal_5fe8f258d29a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403117/normal_60600abb9c7be.pdfIn PDF document text
    • https://wupovejiti.weebly.com/uploads/1/3/2/8/132814541/8204759.pdfIn PDF document text
    • https://ponokexagetax.weebly.com/uploads/1/3/4/3/134326843/jituw_tinapizabefil.pdfIn PDF document text
    • https://kexexetipo.weebly.com/uploads/1/3/4/8/134897314/pasivuzowavu.pdfIn PDF document text
    • https://luwuruguvuwotom.weebly.com/uploads/1/3/0/9/130969706/lenevod_xoxofewig.pdfIn PDF document text
    • https://lenalavawin.weebly.com/uploads/1/3/4/7/134732275/tamepufuruk.pdfIn PDF document text
    • https://luxexawasoju.weebly.com/uploads/1/3/4/1/134109261/talipaguvowuzo.pdfIn PDF document text
    • https://jaginozowelizuf.weebly.com/uploads/1/3/4/7/134729204/tumasuzuxaj.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/jaxalekejuserera.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445337/normal_60c10bf71495b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479439/normal_600b0078676e7.pdfIn PDF document text
    • https://wodaxudufusan.weebly.com/uploads/1/3/0/8/130814186/2973261.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421354/normal_5ff94511ac611.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/80d58886-e5d4-44ae-9c20-45e40350e310/what_describes_dimensions_of_conflict-handling_intentions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57dbc923-dad7-4744-ab55-bf07ca114ea8/77173717636.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e75aa2ab-1af9-49da-92b8-fb72939f544f/kozuwaturenunilubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1393024-097f-4f9f-be99-ed598fa0f4e9/how_does_iso_31000_defines_risk_management.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_off0000e14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 4904 bytes
SHA-256: a769ad24dfae2f8156b71bf5291f931427e50a40d5859f83e0d0237521ac3ec8
font_01_sfnt_off0000f212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF212 11308 bytes
SHA-256: 3b570c65ad700d58af9c1ab4758c41c407ba72b0cd30ceb4a88ee39e509bd9fc
font_02_sfnt_off00011847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11847 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378