Malicious PDF — malware analysis report

Static analysis result for SHA-256 221d120ebf3ef251…

MALICIOUS

PDF

72.6 KB Created: 2021-04-14 21:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f488d284c820d377b0d737312f82a0ed SHA-1: 0ff716e45b36e8d949c1a9c008b3de6d5b31fb3e SHA-256: 221d120ebf3ef2517c2fa3963629ddf6135ce5edae2b2fda8b68b59c19883428
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 0.9960

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://maypoin.ru/strik?utm_term=honda+civic+2006+for+sale+in+pakistan PDF link annotation
    • https://lerasakob.weebly.com/uploads/1/3/2/6/132682990/wazozuxezonunav-zixoveguwimavis-tewirugalanax-dojoxifapix.pdfIn PDF document text
    • https://ridimejaxokixis.weebly.com/uploads/1/3/5/3/135340331/wevifuxegiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427077/normal_5fdc416d250b3.pdfIn PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/e02d741a0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489415/normal_604b83406805b.pdfIn PDF document text
    • https://fokifukamanur.weebly.com/uploads/1/3/0/8/130874497/75f21a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483870/normal_5fd18aa8222d4.pdfIn PDF document text
    • https://dapapakutuluj.weebly.com/uploads/1/3/1/3/131384169/xenusudepuva.pdfIn PDF document text
    • https://xananitape.weebly.com/uploads/1/3/4/0/134095977/7197424.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496824/normal_5ffc1b60bcec6.pdfIn PDF document text
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/bulek-nizefufamowusa-woduvoperanilax.pdfIn PDF document text
    • https://tipuzivi.weebly.com/uploads/1/3/0/9/130969377/3077708.pdfIn PDF document text
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/detufamiwarututuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417313/normal_6067e58ad53f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450631/normal_5fe17245cb98e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413374/normal_6019984094491.pdfIn PDF document text
    • http://jolawusivig.iblogger.org/45303892222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403818/normal_6018004589d13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490917/normal_5ff8580224a33.pdfIn PDF document text
    • https://nivavige.weebly.com/uploads/1/3/0/7/130739715/fuvezanerapazin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410965/normal_5fd1b10ef072b.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/jopalotobur_lejezabodaz_wovuwazumowesul.pdfIn PDF document text
    • https://lifovidas.weebly.com/uploads/1/3/1/8/131856672/9481111.pdfIn PDF document text
    • https://tewefoxik.weebly.com/uploads/1/3/4/8/134857012/5211514.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mopuminamopox.epizy.com/88949203112.pdfIn PDF document text
    • http://wigazimo.epizy.com/arkanaut_company.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_off0000dd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD87 5660 bytes
SHA-256: 15bb581408e1c07fe12dae317baf3d971f5aada1059f10c3a203b85d02dcc855
font_01_sfnt_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 10496 bytes
SHA-256: c03c29b997d00378bac2d454110ad16bbf303f7c3360970d1d3d392dbbdba140