Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfab354c5b61c13…

MALICIOUS

PDF

78.3 KB Created: 2021-02-05 06:26:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2f5cbc67b69ab45acea6d8bd2a775fb8 SHA-1: eb342ec3a4be78e4439f76300365b1fff67acc04 SHA-256: 1bfab354c5b61c1386cc0961ad0d61bfd2cc45ef0029c911ecd224ef64bdd075
134 Risk Score

Malware Insights

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

The PDF document uses a lure related to an Amnesty International death penalty report to entice users to click on embedded links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload.

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://leonvi.ru/aws?utm_term=amnesty+international+death+penalty+report PDF link annotation
    • https://cdn.sqhk.co/pobopuwubox/nih6idE/cartoon_cat_fake_call.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/DjbIhbg/fuvajupajezo.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/aJhhtnH/38449791050.pdfIn PDF document text
    • http://ludshop.xyz/grand_stickman_rope_hero_adventure_mapsuxw7d.pdfIn PDF document text
    • http://wurogutevifo.iblogger.org/new_ps2_emulator_for_android_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/hdrtyU7/56306206692.pdfIn PDF document text
    • https://cdn.sqhk.co/gojogefe/Xib3GJB/smart_balance_light_ingredients.pdfIn PDF document text
    • http://boxberry-24.cc/531078777024gtm8.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/ghAiagj/learn_python_online_free_courses.pdfIn PDF document text
    • http://opsnatur.fun/46413470732x0du1.pdfIn PDF document text
    • https://cdn.sqhk.co/vakusukereju/jhhi8jg/snake_classic_mode_challenge.pdfIn PDF document text
    • https://cdn.sqhk.co/jepivitixiwo/5BgiPYc/srs_vidyapeeth_samana.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/htEifjh/neon_light_running_vest.pdfIn PDF document text
    • http://maturibcgj.space/981490797027cbi.pdfIn PDF document text
    • https://cdn.sqhk.co/dibidoretu/igigdhb/photo_editing_app_for_pc.pdfIn PDF document text
    • http://mritzoliver.design/dujavutosizumesedosa66lpo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zatejufeg.rf.gd/kosuxonenupitakojez.pdfIn PDF document text
    • http://jemumanapumaze.epizy.com/83859933978.pdfIn PDF document text
    • http://kelujatideligo.epizy.com/kirevewo.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_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 5288 bytes
SHA-256: 621ab6761ce87fa4a3837db6914c5535e425a25054c08fc1ccebf600e84e7c85
font_01_sfnt_off0001055c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055C 11196 bytes
SHA-256: be02f9d8d5e11bb0acb4a074cb46e157082a3ff0828003df1e70be97d6aa850c

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