Malicious PDF — malware analysis report

Static analysis result for SHA-256 26842bf5f2ba57ea…

MALICIOUS

PDF

80.8 KB Created: 2021-03-15 15:19:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 45240253a8932fce3e569541eaa48b18 SHA-1: d30f0bd5361f4faa71d46cf70882d4d9b6382cc7 SHA-256: 26842bf5f2ba57ea83da03ff3cea652c31586f5d2edeb494879661c53413a931
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the document's structure and embedded URLs point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=fake+sms+apkmirror In PDF document text
    • http://tiktokcopyrighthelpteam.com/7796685836gkzp.pdfIn PDF document text
    • http://igcopyrightforhelps.com/6214005191sfywf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460975/normal_5ff7df34adb81.pdfIn PDF document text
    • https://cdn.sqhk.co/timadupak/hiyiDjf/xexumep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383681/normal_5fe2775f504b1.pdfIn PDF document text
    • https://cdn.sqhk.co/fusulelibev/jgFie3N/buoyant_force_worksheet_middle_school.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415782/normal_6004e057c06d0.pdfIn PDF document text
    • https://cdn.sqhk.co/gikunixa/2vhiibL/zamalotemedokiwuwowuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418590/normal_60276054ccc1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448346/normal_60248d53cde1a.pdfIn PDF document text
    • http://trikotoria.ru/26648006949ongwi.pdfIn PDF document text
    • https://cdn.sqhk.co/litazujizime/3Bkhiia/bedemafiwikutidokerevado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478716/normal_602bf205bc418.pdfIn PDF document text
    • http://gprofights.ru/shams_tabrizi_40_rules32r47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367297/normal_5fe4d2ef048fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373526/normal_602151bc1087b.pdfIn PDF document text
    • http://theharaka.online/391236785898rqiv.pdfIn PDF document text
    • https://cdn.sqhk.co/komagiju/mRiascE/45740635219.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3aab0fb-6e62-4040-9159-fff43e2f27dd.filesusr.com/ugd/9b2d9b_8f4eca681a0a42f9bb3e95e2a117229e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/vurakepitoriteri.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/59062563131.pdfIn PDF document text
    • https://adc67df4-9ac4-4169-8225-f8d60376216a.filesusr.com/ugd/a1c2c7_3d0ee74c31d242c28ae93c33e4e78991.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/31142608548.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/87265892330.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/65765653204.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 4952 bytes
SHA-256: 2266d312792f2404f7e51a551b304e4b64d25a753fdd475e5d59034a457b9d5e
font_01_sfnt_off0000f711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 12460 bytes
SHA-256: f1a457fd56c6c1f9d90a77e81324dc88e1166f3965ebf568afddcba8b3f89b2c
font_02_sfnt_off00011f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F69 16084 bytes
SHA-256: 6bc3c0a07cf69e32b7b44c2bd5cb36414567d6079e008e5b6982b4757f28630b