Malicious PDF — malware analysis report

Static analysis result for SHA-256 850f15859b2dfb8c…

MALICIOUS

PDF

77.4 KB Created: 2021-06-06 01:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: aa0a029bf8ee33c93620f1b0b0f62b86 SHA-1: c4ed657c58f9261640633cf330a4e95a396f49e9 SHA-256: 850f15859b2dfb8c75822518a5ca98a5ac72c5b070e4f7bd4950bb98a90eecc9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it is a link farm on disposable hosting, designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to external resources for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://smidgel.ru/pbw?utm_term=2010+dodge+charger+repair+manual+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405895/normal_60509289247a6.pdfIn PDF document text
    • https://kepuromoru.weebly.com/uploads/1/3/4/9/134902866/vofiboz.pdfIn PDF document text
    • https://sixupotivene.weebly.com/uploads/1/3/4/3/134305687/siwudifojolura.pdfIn PDF document text
    • https://fudisilutopunus.weebly.com/uploads/1/3/1/4/131438012/762e4.pdfIn PDF document text
    • https://vuvudarekiw.weebly.com/uploads/1/3/4/0/134017261/4178906.pdfIn PDF document text
    • https://zodosixuwe.weebly.com/uploads/1/3/4/8/134863902/7771813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483589/normal_60b7ff63a1292.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389384/normal_60645c49098f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pinurakus.pbworks.com/w/file/fetch/144533037/smart_home_security_systems_nz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0ad30a9-e8b8-43be-b067-d7796e6c5679/problemas_resueltos_del_maximo_comun_divisor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b667ebb3-7bed-4786-9251-c057d078917d/romoss_power_bank_guide.pdfIn PDF document text
    • http://numefen.pbworks.com/f/gubow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c52ae990-2d6a-4880-bc4a-e06092909808/jeux_de_rle_fle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79d1b0ab-103e-4485-b2db-0e0eeffdfcba/how_to_answer_questions_like_why_amazon.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144420690/original_crazy_frog_ringtone_download.pdfIn PDF document text
    • http://wotasaful.pbworks.com/f/nafudoselosoj.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/f/the_mummy_3_full_movie_download_in_hindi_dubbed_480p.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_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 5624 bytes
SHA-256: 6d326b75919c4596a489b758647920a601cfc05e8b98c2512ebce40d0d471ea8
font_01_sfnt_off000102b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B2 11080 bytes
SHA-256: 6349161f8085075c0f733ab616fca0f42a74f34a2336fcb3482c47b92e3ec84f

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