Malicious PDF — malware analysis report

Static analysis result for SHA-256 df53834df23189a1…

MALICIOUS

PDF

77.7 KB Created: 2021-06-01 18:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a6dae697a6d5000d699e73e2a417995d SHA-1: 04c694c993bbe2bfee3f404a4c94fa9e7b23a752 SHA-256: df53834df23189a1d7ec28c7589deaaa7a33e5d9e946a037579caead19c6694b
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, many pointing to disposable hosting services, indicating a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://drafthe.ru/pbw?utm_term=best+research+questions+examples PDF link annotation
    • https://dobuxodujunov.weebly.com/uploads/1/3/2/7/132741154/zufukufamagekux.pdfIn PDF document text
    • https://sevirisedug.weebly.com/uploads/1/3/6/0/136089940/f142074b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485001/normal_5fdf3d6600db9.pdfIn PDF document text
    • https://jadilibetaz.weebly.com/uploads/1/3/4/8/134871175/jejuzin_jezidopuj_nebiminajido.pdfIn PDF document text
    • https://bolefapazudakaj.weebly.com/uploads/1/3/4/4/134478960/wokiseregamizifobo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369183/normal_5fc673f8297db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481173/normal_5fc79950f0993.pdfIn PDF document text
    • https://ruzovaberup.weebly.com/uploads/1/3/4/6/134651658/eb7d98848c3196.pdfIn PDF document text
    • https://vefotufujipewux.weebly.com/uploads/1/3/4/4/134401009/riziremijanabivo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402032/normal_606c426eee279.pdfIn PDF document text
    • https://vigegenatiborig.weebly.com/uploads/1/3/0/7/130740049/3404408.pdfIn PDF document text
    • https://nawowelefet.weebly.com/uploads/1/3/4/4/134498780/9574887.pdfIn PDF document text
    • https://tufezojaf.weebly.com/uploads/1/3/1/3/131384552/5a12a112bd.pdfIn PDF document text
    • https://venowogofopow.weebly.com/uploads/1/3/4/6/134611371/1982102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492918/normal_601c88e01aad2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403429/normal_60293b0d3b55c.pdfIn PDF document text
    • https://jufasoxoko.weebly.com/uploads/1/3/5/3/135315704/1c87263a147c65.pdfIn PDF document text
    • https://dinumaditu.weebly.com/uploads/1/3/4/4/134479473/1fbb475d4751b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476421/normal_5fd9e820b85ee.pdfIn PDF document text
    • https://bulumivivowusip.weebly.com/uploads/1/3/4/6/134667270/durobonoxa.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://xetibubib.pbworks.com/w/file/fetch/144425631/is_a_crystalline_carbon_allotrope.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/borg_warner_t5_fluid_capacity.pdfIn PDF document text
    • http://gosirata.pbworks.com/f/71318914514.pdfIn PDF document text
    • http://tusawijer.pbworks.com/f/34745843995.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_off0000e5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CC 5296 bytes
SHA-256: b4ed204bf0c0375c081c813acacf18c78aaa4b9ef519a47fb733080a82c2c459
font_01_sfnt_off0000f7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 10468 bytes
SHA-256: b8ad24c4f7bcb715f696d7d1026b753f104b11779e91bf9e16a158214753a71c
font_02_sfnt_off00011b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B37 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176