Malicious PDF — malware analysis report

Static analysis result for SHA-256 1187bd5f45385775…

MALICIOUS

PDF

99.9 KB Created: 2021-02-21 07:45:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7789197134255f5ef462888705adbb5a SHA-1: fcd4e60a5b2c8642027e76e2e22893df7581895a SHA-256: 1187bd5f453857750a20a44f7913873cf29cf6494b50f001797def35326a7428
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://maypoin.ru/strik?utm_term=through+the+black+labyrinth PDF link annotation
    • https://jelebemurufipo.weebly.com/uploads/1/3/4/4/134442628/5661886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419235/normal_602309b5ed865.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/z4ZGibd/the_bubble_shooter_story_level_164.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/jftrji8/xadiva.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/eheQj77/lego_marvel_superheroes_2_deluxe_edition_switch_review.pdfIn PDF document text
    • http://natur-bio.space/jopoliligezuqtdkn.pdfIn PDF document text
    • http://lumacy.site/zinomajufekopowuzalubxvmrs.pdfIn PDF document text
    • https://cdn.sqhk.co/wotirixa/XWtwie5/56823715284.pdfIn PDF document text
    • https://cdn.sqhk.co/tupipitijil/N8KQidH/learn_how_to_invest_in_stocks_for_dummies.pdfIn PDF document text
    • http://rujajabejeveto.66ghz.com/oceanic_sheeted_dikes.pdfIn PDF document text
    • https://cdn.sqhk.co/kapidibewomu/7qmifI6/69168953964.pdfIn PDF document text
    • http://garantiya62.ru/bodyguard_movie_20185kffo.pdfIn PDF document text
    • http://businessoutsourcing.info/zinepoponno01.pdfIn PDF document text
    • https://cdn.sqhk.co/pegebatanuz/5nEwhiW/lalevuduxonidemiraga.pdfIn PDF document text
    • https://cdn.sqhk.co/lukavago/ifmQgiX/color_shift_wrap_avery.pdfIn PDF document text
    • https://lolorude.weebly.com/uploads/1/3/0/7/130775760/tasumaxawapum_siriwumuzilapij_devijagigafopov_kefak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00014c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4A 5136 bytes
SHA-256: a5de8721d8cd8bff23583e930d4941a75d20a9732d02404b7c258bd4a2b96a23
font_01_sfnt_off00015dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DC8 11008 bytes
SHA-256: 27a565ccdc789d6cbe26d09619aa7225f00d4ebf35e5b8eb85a23222dd859eef

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