Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1e783a1530f717…

MALICIOUS

PDF

83.5 KB Created: 2021-03-16 09:18:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 14cb1de37b99b9d67061cfaf061d90ed SHA-1: 674e312399b5022ae5c9d67c882361b0beb3b588 SHA-256: ba1e783a1530f7178f0e1432e681482601e169ccb9a03ee25c334cd811a4b772
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xezojetit.ru/wix?keyword=cold+war+test+short+answer+questions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416131/normal_5fed4619a1cb9.pdfIn PDF document text
    • https://ruwefenoref.weebly.com/uploads/1/3/0/7/130739117/56b306912b5028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446399/normal_601ee4f995cb2.pdfIn PDF document text
    • https://vidolatukala.weebly.com/uploads/1/3/5/3/135316506/d26b84bb339f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413369/normal_5fe2527f49810.pdfIn PDF document text
    • https://cdn.sqhk.co/niririga/hJHhjg1/bikawaxojudolipu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492574/normal_60049b222c6e3.pdfIn PDF document text
    • http://parirapopuj.22web.org/23930147501.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420756/normal_6041aadf6c536.pdfIn PDF document text
    • https://fegajasun.weebly.com/uploads/1/3/4/5/134502742/b09001268a128.pdfIn PDF document text
    • https://susokeruno.weebly.com/uploads/1/3/4/6/134656617/nagobiburobofowazuba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374366/normal_60019b260afd8.pdfIn PDF document text
    • https://gizomedapirev.weebly.com/uploads/1/3/1/4/131454265/4466636.pdfIn PDF document text
    • http://tevajevidiwa.22web.org/apprendre_l_espagnol_rapidement.pdfIn PDF document text
    • https://cdn.sqhk.co/mujutuzidip/ggjjnhd/cult_of_chucky_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/nawovoso/fOrgjRf/belim.pdfIn PDF document text
    • https://cdn.sqhk.co/ganidabizi/hgcjagi/pokimane_age_instagram.pdfIn PDF document text
    • https://xemibunadagom.weebly.com/uploads/1/3/4/6/134639404/2dc25ab07c68.pdfIn PDF document text
    • https://gagufivelorifig.weebly.com/uploads/1/3/4/5/134596616/8ba73efcb6b21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382430/normal_601b83767d2e5.pdfIn PDF document text
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/togotakujabot_sufig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pinezininefos.epizy.com/xenibab.pdfIn PDF document text
    • http://tizesabukabel.rf.gd/49707531444.pdfIn PDF document text
    • http://sijaxulo.rf.gd/43660351273.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_off000109f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F7 5036 bytes
SHA-256: ce065de46c22db4babb531eb4c7b80fee0e15c92ebaea5bdeb4dba4c3fbab487
font_01_sfnt_off00011b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B17 10880 bytes
SHA-256: ed4bd7d7c673cb955dfbd6913f3f2798d17481721af5479c9a13d4c1db833af5