Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ecb3b32d9a5a117…

MALICIOUS

PDF

76.9 KB Created: 2021-03-10 17:15:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 30ffe5dcadeec7620ce43b7e948021a1 SHA-1: bfcd09970a99930a8dbe2ac681df0f4795b3ecb2 SHA-256: 2ecb3b32d9a5a1175548e3d5f4a74ba021fac4516927dac152b10f9e6bb9a147
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/wix?keyword=ethical+dilemmas+worksheets+english PDF link annotation
    • https://riviruzo.weebly.com/uploads/1/3/0/7/130739493/6444219.pdfIn PDF document text
    • https://cdn.sqhk.co/tigoxexuda/ageFgdC/vunafaxazibejofaweri.pdfIn PDF document text
    • https://penegekefifix.weebly.com/uploads/1/3/4/5/134586424/guvofituranubalem.pdfIn PDF document text
    • https://xewezepi.weebly.com/uploads/1/3/0/8/130813550/7f1a5bcb2b.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/best_classes_diablo_3_season_22.pdfIn PDF document text
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/3620893.pdfIn PDF document text
    • https://lanapovo.weebly.com/uploads/1/3/1/4/131437145/gitebowekelawogumed.pdfIn PDF document text
    • https://pakedarisibibo.weebly.com/uploads/1/3/4/5/134501134/daxubenu-zetunino.pdfIn PDF document text
    • http://lotibamuzuti.scienceontheweb.net/larousse_gran_diccionario_espaol-ingls_english-spanish.pdfIn PDF document text
    • https://gaxopekel.weebly.com/uploads/1/3/0/9/130969853/zetixinalazamomixela.pdfIn PDF document text
    • https://zuberexuwaxif.weebly.com/uploads/1/3/4/5/134501439/lafiv-zukibenun-pemikoju-lidiragad.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/janiwuxolivupedajofa.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/q_see_camera_customer_service_number.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/fdjic3X/comic_world_app_download.pdfIn PDF document text
    • https://barosowuni.weebly.com/uploads/1/3/1/3/131398377/9795199.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_72f7edbb569a4df5aa5576875013a111.pdf?index=trueIn PDF document text
    • https://9604be5c-c174-4808-8a32-87fcad2dbd79.filesusr.com/ugd/10b03a_e53a7cedcd094775a22edc1d6d1e7df6.pdf?index=trueIn PDF document text
    • https://dd39d194-9042-494f-90ab-223c96cf8da5.filesusr.com/ugd/5d3909_ab87e1ef5dab4bdd92f8e462d6db6e4b.pdf?index=trueIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_54b609fc2093415eb00623ac773b4b20.pdf?index=trueIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_b9022475fea641418586daaed4527c25.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7E 5464 bytes
SHA-256: efa07fc4a30d79039fb1139ce8114c3b187c592d3526ec4dbbc395292147fa26
font_01_sfnt_off000101fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FC 10872 bytes
SHA-256: 89f5cd730f5162f1db47d774938280e1e75afb43bb35dc2aa0879ca11bbfde36