Malicious PDF — malware analysis report

Static analysis result for SHA-256 82973a35c6a091d0…

MALICIOUS

PDF

84.6 KB Created: 2021-03-13 17:23:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bf7d064acbe2153870e152af1eabd4ac SHA-1: b1431041ba8055a60f1070d2ded8a14daf4e0928 SHA-256: 82973a35c6a091d0b3dacbcbc4167dd062177861f6f96786d68d5de8b2c02831
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to redirect users to potentially harmful sites. No scripts were extracted, but the presence of external URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/123?utm_term=bricktop%2527+s+paris+pdf PDF link annotation
    • https://zatagigozot.weebly.com/uploads/1/3/0/7/130775916/tikakorinerazem.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/ijFwGdr/monster_hunter_movie_trailer_release_date.pdfIn PDF document text
    • http://noxokolozoj.iblogger.org/risuwikorerojidesetuw.pdfIn PDF document text
    • https://fobepuwup.weebly.com/uploads/1/3/1/0/131070598/c465f8b45e4.pdfIn PDF document text
    • http://baffer-shop.space/laser_draw_free_downloadm63wn.pdfIn PDF document text
    • https://wisevagidigo.weebly.com/uploads/1/3/0/7/130740356/mumizekugikadumo.pdfIn PDF document text
    • https://nimukebobe.weebly.com/uploads/1/3/4/5/134527887/ad17b7.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/jF4gcur/basic_knot_tying_guide.pdfIn PDF document text
    • http://tojubilabesi.22web.org/dendrochronology_lab_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/paxelababeg/s4nhfif/christmas_cake_decoration_crossword_clue.pdfIn PDF document text
    • http://info-pages.ru/842130270002cd11.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3618b43a-a84a-4fb1-970c-77f27992dd3e/naviwalopitavafan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ec1ed64-52e1-4ca1-b5f6-5dc9d735e82c/xuwafudul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c89029e2-1c6b-490f-ab21-ac333999bc4d/operation_management_essay_sample.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_off00010b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9A 5264 bytes
SHA-256: 657e090af8e441bf6591bca434cb5157bd0f4ea5fec6ad253e17e2b21ea30dad
font_01_sfnt_off00011d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9B 11408 bytes
SHA-256: 86e326ac8700c872ba9925509fc5aac62bfd2d14dc369143bf21b64b926dd147

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