Malicious PDF — malware analysis report

Static analysis result for SHA-256 30f90ed23c2a84f6…

MALICIOUS

PDF

76.3 KB Created: 2021-06-14 05:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d586fda7236232a8a42c09ad186933f5 SHA-1: 691ffbbdd918d63ceedfe9da99917f8dd1e59aff SHA-256: 30f90ed23c2a84f62f2eb4f534d223c914171fea7b6852c80cc63e81d1c3ec1e
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 pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://philabc.ru/pbw?utm_term=maths+book+for+class+12+state+board PDF link annotation
    • https://dujeranisijoku.weebly.com/uploads/1/3/0/7/130776063/moxoputikado.pdfIn PDF document text
    • https://xaredoluvowa.weebly.com/uploads/1/3/1/8/131871785/2e4c05db.pdfIn PDF document text
    • https://laxozutamof.weebly.com/uploads/1/3/4/7/134748247/d5eb67b857de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490515/normal_60033d496cb8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481552/normal_5fecd09439727.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383444/normal_604cd439376cb.pdfIn PDF document text
    • https://selimubujupaso.weebly.com/uploads/1/3/4/8/134847774/lolajet.pdfIn PDF document text
    • https://xiwodaboxidedu.weebly.com/uploads/1/3/4/6/134647922/xepuwebuzoxil.pdfIn PDF document text
    • https://doguxugufini.weebly.com/uploads/1/3/0/7/130739878/3966917.pdfIn PDF document text
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/mozewilojugudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386086/normal_6066e07bb9b80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419206/normal_5fdd3deb9afca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guwodav.pbworks.com/w/file/fetch/145282335/fast_scanner_app_download_apk.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/gk_quiz_in_english_for_class_5.pdfIn PDF document text
    • http://gabekujijud.pbworks.com/w/file/fetch/145168977/73108931745.pdfIn PDF document text
    • http://zexowisam.pbworks.com/w/file/fetch/145274910/tamil_songs_download_mp3_masstamilan_2020.pdfIn PDF document text
    • http://veposasidot.pbworks.com/f/how_to_wash_stone_island_soft_shell.pdfIn PDF document text
    • http://faxofapuf.pbworks.com/w/file/fetch/145183365/i9500_root_4.4_2_cf_auto.pdfIn PDF document text
    • http://zikulade.pbworks.com/f/how_to_remove_control_panel_on_kitchenaid_superba_oven.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_off0000eabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABD 5504 bytes
SHA-256: 221e89abe40e8c6d7e6f0c5799bcc530316f29d5f2eb33523f0c4339e656cffa
font_01_sfnt_off0000fd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 11412 bytes
SHA-256: 899772926dbbbd79aa91d3629a3411307c36b56885527895068bce78dff95ec9