Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fbd1e51d38c8aa…

MALICIOUS

PDF

72.7 KB Created: 2021-06-13 22:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b98a9a87e16b897475a0c2edd7cd4c75 SHA-1: 30a13a3f83f53e1d795fcdbfb3453c6f1f636faa SHA-256: 91fbd1e51d38c8aa28b205e20655a22386c6d1c9c43d233460f8293777f99c10
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs that point to a link farm, suggesting an attempt to manipulate search engine results or redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or content-distribution scheme.

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://pistant.ru/pbw?utm_term=mmorpg+minecraft+server+with+classes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480893/normal_6009416e436dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454424/normal_60176f61dd357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450876/normal_603fddaae65a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450421/normal_60bc0d917dba9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426088/normal_606e80f77895c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419211/normal_605b926c50173.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402936/normal_60011c904136f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4418746/normal_60b5345d6975f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447916/normal_600bbae45edcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501360/normal_6027091f292ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453909/normal_6064a697ada5c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tejipufiwuma.pbworks.com/f/75575784444.pdfIn PDF document text
    • http://supulilofib.pbworks.com/w/file/fetch/145172937/how_to_cite_an_article_without_an_author_apa.pdfIn PDF document text
    • http://gufabewa.pbworks.com/w/file/fetch/144457062/9363184438.pdfIn PDF document text
    • http://wuvebag.pbworks.com/w/file/fetch/144612108/city_of_stars_sheet_music.pdfIn PDF document text
    • http://gabumur.pbworks.com/w/file/fetch/144486063/85337662189.pdfIn PDF document text
    • http://tugovozow.pbworks.com/w/file/fetch/145079661/defajuxa.pdfIn PDF document text
    • http://kufavuva.pbworks.com/w/file/fetch/145232763/63000860035.pdfIn PDF document text
    • http://mozejulinuja.pbworks.com/f/smallville_season_5_watch_online.pdfIn PDF document text
    • http://bevosox.pbworks.com/w/file/fetch/145104156/list_of_forest_animals.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 5588 bytes
SHA-256: bdd89f33734630feaa29c9bbcc994ed897e0d1b2a6663716b1e8512ecb04af3a
font_01_sfnt_off0000f269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF269 10320 bytes
SHA-256: 1b55f2df49e5b1cb90fc1aca9c1dcad0c01063e28a0dbb11941b6254a71cb617

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