Malicious PDF — malware analysis report

Static analysis result for SHA-256 80fef1aaddc804d1…

MALICIOUS

PDF

78.2 KB Created: 2021-02-28 09:04:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2e1c9a38b1c6000cb137155992216fe6 SHA-1: c79f7a8f334d74f4c18d701e8ca6e83d34b1ace5 SHA-256: 80fef1aaddc804d1ac2ae4af47bfb773a9b2ff3f075c9b728d171fd9a59c79d7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with a primary focus on directing users to 'seumenha.ru'. Heuristics indicate this is a link farm on disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=penny+stocks+to+buy+in+usa PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4497358/normal_5feeda0db1230.pdfIn PDF document text
    • https://dipitamadupod.weebly.com/uploads/1/3/4/8/134882687/suvevijud.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/jhfVjdm/mejor_app_radio_android_2019.pdfIn PDF document text
    • https://xuxulavadimuxa.weebly.com/uploads/1/3/4/2/134234789/bakilemufo-xoraturedixaval-kanisusin-pakiguvez.pdfIn PDF document text
    • https://fuzewejobedogu.weebly.com/uploads/1/3/1/4/131482867/d91102dd95c88c.pdfIn PDF document text
    • http://delinapod.mypressonline.com/vukuvozavupisajaxira.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/mfibaif/creed_valhalla_wallpaper.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/57166855329.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/22731c603d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://botusojulepeja.rf.gd/good_morning_photos_hd_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/gixumus.pdfIn PDF document text
    • http://gerekuvuburase.epizy.com/musemexigosumisokuvebo.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/pandit_bhimsen_joshi_songs.pdfIn PDF document text
    • http://zekovulelopur.epizy.com/60394687969.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/debumele.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_off0000f684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 4972 bytes
SHA-256: 80370534d28544af77b5781bab8773a594253d61e5309cd759e2a7ddf4b28f4d
font_01_sfnt_off00010792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10792 10660 bytes
SHA-256: ed73676f9df3d029731946f8b9779504b3450de3c1ae7fdfcca66937e4804345

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