Malicious PDF — malware analysis report

Static analysis result for SHA-256 06f2a3c77bfc1ddf…

MALICIOUS

PDF

78.6 KB Created: 2021-06-03 09:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d10ee77b7fde2fb701cc24007b417f57 SHA-1: 51b078a969d9050c1ec501638f8be7430cfe4090 SHA-256: 06f2a3c77bfc1ddf4e8014d174d75fb2628bae460b8bf4dcf0f3ebab20142587
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm designed to host malicious content. The primary malicious URL identified is https://irlanc.ru/pbw, which is likely used to deliver a secondary payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://irlanc.ru/pbw?utm_term=how+to+prepare+to+chair+a+disciplinary+hearing PDF link annotation
    • https://foxufaba.weebly.com/uploads/1/3/1/4/131482874/debev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_60546441632e9.pdfIn PDF document text
    • https://xuwutofir.weebly.com/uploads/1/3/0/8/130813860/2465174.pdfIn PDF document text
    • https://dasubafetimediz.weebly.com/uploads/1/3/4/6/134673415/61ae2a91d.pdfIn PDF document text
    • https://kenomipijisax.weebly.com/uploads/1/3/3/9/133986884/tapipowi-bososonur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490125/normal_5fe7001e6aaeb.pdfIn PDF document text
    • https://migobagola.weebly.com/uploads/1/3/4/8/134874333/d992a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460465/normal_5ffdd2dc3aad0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482216/normal_603d7ee22a78b.pdfIn PDF document text
    • https://kijesutezex.weebly.com/uploads/1/3/5/3/135328712/ab6e892ad75.pdfIn PDF document text
    • https://rimovume.weebly.com/uploads/1/3/1/4/131452953/53e71939.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mumubib.pbworks.com/f/mijokosimimurako.pdfIn PDF document text
    • http://dekokos.pbworks.com/w/file/fetch/144418188/what_is_the_sentence_for_a_class_d_felony.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2042aec-049d-4c88-8937-1e2ccfa2d099/kamipafurugumoxipelekupax.pdfIn PDF document text
    • http://paditoxef.pbworks.com/f/1753970247.pdfIn PDF document text
    • http://gitefov.pbworks.com/f/star_wars_score.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/144470703/tisigit.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/w/file/fetch/144415746/free_presets_for_lightroom_pro_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e203949-fb56-4d75-ab06-ccb602fc6076/74451710227.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/f/does_kaiser_provide_rapid_covid_testing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bd81408-ed01-457a-a288-8277a5dbd053/how_to_reset_a_whirlpool_duet_sport_dryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9704556-64be-4aa3-9505-8894c1aff179/amigo_brothers_story_theme.pdfIn PDF document text
    • http://niluputevi.pbworks.com/w/file/fetch/144448908/how_to_use_chick_fil_a_gift_card_on_doordash.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_off0000f6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E6 5488 bytes
SHA-256: 5500e057c1a6f9aa6e2010660e6a4c61b9f943f47a19b8edd5601e0c5036148d
font_01_sfnt_off000109a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 10308 bytes
SHA-256: d6b3f23e1362ea2b5b5693e34baba02066f117325c56bac01ee9bb811d88013c

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