Malicious PDF — malware analysis report

Static analysis result for SHA-256 41027c6be418e752…

MALICIOUS

PDF

80.8 KB Created: 2021-03-06 14:47:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fe4e4dddc521eac9c854a01d4c82c435 SHA-1: bb8a5644ebf4cc1afa2dae555236d4f9a1b29586 SHA-256: 41027c6be418e7529d7498235c380ca9a393bdc6640535a49f5933b41e89d9b6
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 hosted on disposable domains, indicating a link farm or phishing attempt. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

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://xezojetit.ru/strik?utm_term=how+to+take+leave+navy PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460058/normal_5fe1c5bdd1e59.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/idFgdia/tugafoxa.pdfIn PDF document text
    • https://cdn.sqhk.co/jukelifawap/FhgvaQQ/duwojiferubadunawodikot.pdfIn PDF document text
    • https://tupinikuwexopej.weebly.com/uploads/1/3/1/0/131070806/e96234c2.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/gelbjgd/sikuv.pdfIn PDF document text
    • https://govewusig.weebly.com/uploads/1/3/0/9/130969429/bifolodafafipelumim.pdfIn PDF document text
    • https://cdn.sqhk.co/fabupiguboxa/ajgIhbi/pobefila.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/ajcCUic/nasiriroviretowul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412151/normal_5fc610edc115e.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/ihc1pgd/74129059387.pdfIn PDF document text
    • https://wixolovab.weebly.com/uploads/1/3/0/7/130776385/5386471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473403/normal_603fc15526d53.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuzigup/hswgjlY/contract_killer_zombies_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/votezevon/a7hbDhf/10255904531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467576/normal_5fdb02a91317a.pdfIn PDF document text
    • https://cdn.sqhk.co/niramojiga/J0gfwqP/microban_24_hour_disinfectant_sanitizing_spray_meijer.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
    • https://uploads.strikinglycdn.com/files/caa36e4b-fe6f-4d1d-8d71-7c57858119a2/jivumuzu.pdfIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_b029d2d5cdca49838bded41bd1e062eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be70236a-a3ff-4dfd-ad93-9d5f7b1cd9d3/80268830754.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_6dd301237bf2498eb332dbe9684153b6.pdf?index=trueIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_899bb07ca06744399341243a473e97a8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF514 4424 bytes
SHA-256: 5e8548c94453b71b6aae8c52019dfbd86350dd897106e77c13d89851513d7eb8
font_01_sfnt_off00010446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 10320 bytes
SHA-256: 5ef32cfd44fb4433ef1edfc9ade08fa22200a49d67c7ad8074ba7ce8d303eacb
font_02_sfnt_off000127b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176