Malicious PDF — malware analysis report

Static analysis result for SHA-256 4897318cd3dc5577…

MALICIOUS

PDF

79.7 KB Created: 2021-06-02 11:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 55a9f90193da87f384368c43bb247212 SHA-1: 521c3429241f8732f76087e70ed303beb1158308 SHA-256: 4897318cd3dc55771b164b607017c3601dda13903584a98445c297104aa54854
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://zajinet.ru/123?utm_term=lite+brite+sheets+printable+free PDF link annotation
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/zetejeb-zuduju-jakoru-metefizefiw.pdfIn PDF document text
    • https://lepatoketi.weebly.com/uploads/1/3/4/7/134732542/23a62e67.pdfIn PDF document text
    • https://rexuxoxef.weebly.com/uploads/1/3/4/0/134018301/9742790.pdfIn PDF document text
    • https://fevolasoboz.weebly.com/uploads/1/3/7/5/137514380/8654756.pdfIn PDF document text
    • https://wapavamo.weebly.com/uploads/1/3/1/6/131637186/5cf6db.pdfIn PDF document text
    • https://guzesunidami.weebly.com/uploads/1/3/0/8/130873942/d296a2598e0.pdfIn PDF document text
    • https://suzazega.weebly.com/uploads/1/3/4/4/134476369/5466459.pdfIn PDF document text
    • https://zumikefu.weebly.com/uploads/1/3/4/8/134886628/3a1f4e770.pdfIn PDF document text
    • https://fodumalape.weebly.com/uploads/1/3/2/6/132695584/1ec7d533c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421960/normal_6031df63101f9.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4403936/normal_60afe8443d362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480414/normal_60511a883af86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_60306b5f50013.pdfIn PDF document text
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/sekedopi-tamida-wasiwu-tiwesejo.pdfIn PDF document text
    • https://fixaninupokawaw.weebly.com/uploads/1/3/0/8/130873986/c2e65ae2.pdfIn PDF document text
    • https://mesikanuxiruk.weebly.com/uploads/1/3/1/6/131636832/sulidanonuzo-gegimilekosum-zabiguxib-dodeverise.pdfIn PDF document text
    • https://dozumudokasalog.weebly.com/uploads/1/3/4/9/134902229/5d6c1728d.pdfIn PDF document text
    • https://febotobelem.weebly.com/uploads/1/3/0/7/130739539/tefebivunorobo.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
    • http://zeladejan.pbworks.com/w/file/fetch/144441252/kabir_singh_full_hd_movie_720p_bluray_download.pdfIn PDF document text
    • http://litorabi.pbworks.com/f/8654923754.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_off0000eedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 4748 bytes
SHA-256: 556e419a9aaede2da069108d340b747e87906ed81de4b0c51e968cc1c2d30d1a
font_01_sfnt_off0000fee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 10732 bytes
SHA-256: 51565c5be40c6c2887ad1b1fc80d130f1fd98e9ae424ccbcc0c55eff5b68da9b
font_02_sfnt_off0001237c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378