Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeee2fe3f828ab78…

MALICIOUS

PDF

70.3 KB Created: 2021-05-31 12:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 31b9919e871d27e4ed0c3ae17e4b5b8a SHA-1: f5e85a62389c469e7a8143f29d4dfa95204ad4de SHA-256: eeee2fe3f828ab7804021bbbb4fed8c54ae2c8694b9063b434dcd0e07021009b
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to various PDF files hosted on disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this file as malicious, with ClamAV specifically identifying it as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the nature of the link farm suggests a phishing or SEO manipulation scheme. The presence of embedded URLs and the overall structure point towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/123?utm_term=callan+method+book+1+pdf+free PDF link annotation
    • https://fipogelijemebu.weebly.com/uploads/1/3/1/3/131398193/1657391.pdfIn PDF document text
    • https://putokosufigaso.weebly.com/uploads/1/3/4/3/134314115/2567d266.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414502/normal_5feb91505575a.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/7509258.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/rojurejumogumusokewa.pdfIn PDF document text
    • https://zejofisedefumot.weebly.com/uploads/1/3/4/6/134667534/gitibomoteligoza.pdfIn PDF document text
    • https://mosazipabefo.weebly.com/uploads/1/3/4/7/134735261/peduwobavofirewit.pdfIn PDF document text
    • https://rusijarumeza.weebly.com/uploads/1/3/1/8/131871651/24822.pdfIn PDF document text
    • https://jixawapideraje.weebly.com/uploads/1/3/3/9/133997308/vovixekuwivitabo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401714/normal_5fc915c9548cf.pdfIn PDF document text
    • https://boxijobanopuvob.weebly.com/uploads/1/3/0/7/130739783/cc3babf7e.pdfIn PDF document text
    • https://kekebamifibem.weebly.com/uploads/1/3/1/6/131606854/f2879.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475559/normal_5ff8657356a8d.pdfIn PDF document text
    • https://katalajoguv.weebly.com/uploads/1/3/2/7/132740778/melagapibola.pdfIn PDF document text
    • https://zurenigexozaxil.weebly.com/uploads/1/3/4/6/134606750/gewizutezarugozi.pdfIn PDF document text
    • https://mesovozilepako.weebly.com/uploads/1/3/4/5/134588792/aff3f926fb123a.pdfIn PDF document text
    • https://tawisowa.weebly.com/uploads/1/3/5/3/135315305/9642297.pdfIn PDF document text
    • https://nesojikav.weebly.com/uploads/1/3/1/3/131398336/0dded947c32e1.pdfIn PDF document text
    • https://kalaxokesipak.weebly.com/uploads/1/3/4/8/134888683/xanori-buwaga-naxov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d65df53a-9594-432f-b24e-c89f46036855/22474910266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/984a5f0f-ad8f-4062-b9f6-7dcf552c32df/how_to_turn_on_a_hamilton_beach_iron.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/954e1d93-a6ac-4c14-962f-20d065db8818/witchcraft_oracles_and_magic_among_the_azande_review.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_off0000d39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39A 5264 bytes
SHA-256: a04bd22dc3844976fe6ddbcc438c2080cc5fb9e599a1515a7b9d9e7c1aa1929e
font_01_sfnt_off0000e550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE550 11204 bytes
SHA-256: deb62b29f5b1a5ca48ab1679404c55c22bba918f1f1c861cc3fa60ca000823b9