Malicious PDF — malware analysis report

Static analysis result for SHA-256 1118bf1e3814404e…

MALICIOUS

PDF

74.2 KB Created: 2021-06-11 05:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 94cf70ed208d22b702d2d4a91424de6b SHA-1: c335280a05d75b2b8e0eeb04602bbf7cea2e6a13 SHA-256: 1118bf1e3814404eb63449dfeb5502d12710c9dadbf3fb6332a01496f47360e0
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, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites.

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://drafthe.ru/pbw?utm_term=java+automation+interview+questions PDF link annotation
    • https://rikafikisejale.weebly.com/uploads/1/3/0/7/130740062/punukejinu.pdfIn PDF document text
    • https://paduzegisenulun.weebly.com/uploads/1/3/4/6/134665595/509acbbe183debc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456377/normal_6059ec77b51f8.pdfIn PDF document text
    • https://tedibijufu.weebly.com/uploads/1/3/4/6/134678634/najimerogodasof_pujaxezi.pdfIn PDF document text
    • https://ponadolofulofuk.weebly.com/uploads/1/3/1/3/131398561/biditineganaru.pdfIn PDF document text
    • https://xowivana.weebly.com/uploads/1/3/0/8/130813667/20a31.pdfIn PDF document text
    • https://razixolinatu.weebly.com/uploads/1/3/4/3/134384461/lusevafufagemamew.pdfIn PDF document text
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/2590124.pdfIn PDF document text
    • https://sajefabavasa.weebly.com/uploads/1/3/2/7/132710755/zijejewufebivigiz.pdfIn PDF document text
    • https://rovividupezudu.weebly.com/uploads/1/3/4/3/134373795/dafilekamu_puxezepenabuf_wozumuwavipor_rudugo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401518/normal_60625e2170fc7.pdfIn PDF document text
    • https://xuzonikafu.weebly.com/uploads/1/3/5/3/135351414/96145bd2b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417413/normal_5fd1951355a81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470980/normal_6003ab22704b7.pdfIn PDF document text
    • https://tiwilofudux.weebly.com/uploads/1/3/1/6/131606348/jelenawogati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490140/normal_6065377e2be4e.pdfIn PDF document text
    • https://didegesub.weebly.com/uploads/1/3/2/6/132681352/185688.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493610/normal_5fc5a1c1d113d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392857/normal_5ff151eab5042.pdfIn PDF document text
    • https://gunupilerupuva.weebly.com/uploads/1/3/1/8/131871796/46e5e42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xefobukeza.pbworks.com/f/ramumawolevekanawem.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/f/lekumusomodegeziwinov.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/w/file/fetch/144731175/how_to_curse_in_roblox_without_tags.pdfIn PDF document text
    • http://gamanovu.pbworks.com/f/kemejupejediwe.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_off0000e3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CC 5064 bytes
SHA-256: ffca7ed9ffdd4710fecb5bd0f47dcace97272d8576b85c5b0a854b06ef045592
font_01_sfnt_off0000f50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 11380 bytes
SHA-256: a9c7fffc41afc654e9d11174116dfcb716e2e62952a69b063b7dc647393b2f4f