Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c68edc43162e18…

MALICIOUS

PDF

69.0 KB Created: 2021-03-28 06:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4c9271aca999d874291f781d7e236c26 SHA-1: 719f1d4479fbd778fc9ecf9693e48553d830f477 SHA-256: e3c68edc43162e182a525d1e0db1ed7e51df1e1caa1dbef81df51e81b174c709
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious redirection or content hosting scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/123?utm_term=they+answer+me+in+spanish PDF link annotation
    • http://comforfemj.fun/learn_english_grammar_through_tamil9o9gq.pdfIn PDF document text
    • https://lagomumudalo.weebly.com/uploads/1/3/2/6/132681699/jepijawo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380380/normal_5ff9cf8662d56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488582/normal_604af523a2452.pdfIn PDF document text
    • https://sudejewakigalo.weebly.com/uploads/1/3/4/0/134040490/7263490.pdfIn PDF document text
    • https://vutepunuvo.weebly.com/uploads/1/3/1/6/131637517/woxosobote.pdfIn PDF document text
    • https://lolipakefupixo.weebly.com/uploads/1/3/4/6/134614949/tanixitarisebob.pdfIn PDF document text
    • http://rafale.store/68233017937mv9fd.pdfIn PDF document text
    • http://accface.in/kamotokifotafiloduxuludmy66b.pdfIn PDF document text
    • http://avtoshkola-region26.ru/samsung_galaxy_s5_datenblattd0cwl.pdfIn PDF document text
    • https://xafosaxit.weebly.com/uploads/1/3/1/8/131859261/5247020.pdfIn PDF document text
    • http://help-copyrighteamservice.com/la_carcacha_compositoriiduv.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/dijibudiwogegagexos92hb6.pdfIn PDF document text
    • http://begemotiks.space/pebudegt22.pdfIn PDF document text
    • https://disomigezet.weebly.com/uploads/1/3/4/2/134234605/7009655.pdfIn PDF document text
    • https://jigerilo.weebly.com/uploads/1/3/4/7/134702464/ritorusazow-vulijolo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_6027461612836.pdfIn PDF document text
    • http://aydym.club/943703176827lfio.pdfIn PDF document text
    • http://creditreportusa.info/dialectic_of_enlightenment_explained4l9my.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467955/normal_5ff5115b37bca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455207/normal_60290ed6f2b1e.pdfIn PDF document text
    • https://fuxovibafisiboj.weebly.com/uploads/1/3/0/8/130874455/gobixififuzu.pdfIn PDF document text
    • https://morisoxurekes.weebly.com/uploads/1/3/4/4/134464458/5660283.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_46ca889014074861bed6efd13ef902df.pdf?index=trueIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_85b174346aa7485bbe8218cc68e71e90.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_off0000cf36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF36 5172 bytes
SHA-256: e1e569edd92c1409d20e02b630591c516550c523ee4cf0d48a6bcbbbdfdc6611
font_01_sfnt_off0000e0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B8 11552 bytes
SHA-256: 83ef1632bbe146f0d3c37a32aa77d3d4f63b06f2b670e3e322603968f3332c38