Malicious PDF — malware analysis report

Static analysis result for SHA-256 5267614818ae6c81…

MALICIOUS

PDF

61.5 KB Created: 2021-01-29 23:57:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ff3dd66a6368298a2ecaf999456c4bd9 SHA-1: 623659e1f9e0120da9ca7b7ee0a337854dc2b047 SHA-256: 5267614818ae6c8101ab982bce9b88c3555e6f7e9eb977d68a9ed276c24e970c
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to disposable domains and are associated with known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://yafferge.ru/123?utm_term=who+made+the+potatoe+salad+online In PDF document text
    • http://dostafood.xyz/25566879171i8866.pdfIn PDF document text
    • http://uanews.website/raresitinulextter.pdfIn PDF document text
    • https://babivefe.weebly.com/uploads/1/3/5/3/135312435/1360791.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374696/normal_5fcb8f54d564d.pdfIn PDF document text
    • http://idealslimitaly.site/lego_batman_dc_super_heroes_unite_movieona4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501479/normal_5ff3cd1dcfb69.pdfIn PDF document text
    • http://freedate18.xyz/navadeal_ant_farm_castleqwccd.pdfIn PDF document text
    • https://milixugaxezo.weebly.com/uploads/1/3/1/8/131856079/3b5842c70dca.pdfIn PDF document text
    • http://resimpub.com/52642481369z1zo7.pdfIn PDF document text
    • https://vijapuloxo.weebly.com/uploads/1/3/0/7/130775263/e162a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496151/normal_5fc69005282e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497358/normal_5ff54c65c46d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445564/normal_5fed922962747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416661/normal_600d91d66f370.pdfIn PDF document text
    • https://legaxebojidonet.weebly.com/uploads/1/3/0/7/130775342/fisasedus.pdfIn PDF document text
    • http://retys.space/download_game_crowd_clash_moduck9p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/48215798339.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_off0000b32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32F 5116 bytes
SHA-256: 23ee594a335337a8f4dfef375e1f2d7bebd38fb1be257bff9256701dd6113809
font_01_sfnt_off0000c478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC478 10724 bytes
SHA-256: 9c9b78e84780d4b0e33bbae65ed4c4bbb4c7336f6b66fa0c032e2382b1a9300e

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