Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d2caaffcee3b0e…

MALICIOUS

PDF

69.6 KB Created: 2021-02-21 05:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3e1bbd6e17fcce2389a7d06b79f1da0c SHA-1: a248d62fda434e176866fa2a3cda182f0e9569ee SHA-256: 25d2caaffcee3b0e6bc282565fd342ad40064192bde89d176cd7507eb8dadcd1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains multiple embedded URLs, with one prominent URL suggesting a movie streaming lure. Heuristics indicate this PDF is part of a link farm hosted on disposable domains, and ML classifiers and ClamAV strongly flag it as malicious phishing content. No scripts were extracted, but the presence of numerous external links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=el+nombre+de+la+rosa+pelicula+completa+en+espa%25C3%25B1ol+latino+online PDF link annotation
    • https://cdn.sqhk.co/mapetidul/6giijjd/gacha_life_testing.pdfIn PDF document text
    • http://wusejopajaxus.22web.org/82492156730.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/dXcBFib/pico_iyer_ted_talk_ping_pong.pdfIn PDF document text
    • https://babidunilatejob.weebly.com/uploads/1/3/4/2/134266015/51d2b564f80d95b.pdfIn PDF document text
    • http://beststudent.space/wurowinariwadorebebelr1gjy.pdfIn PDF document text
    • http://penerete.66ghz.com/aaqa_meriyan_akhiyan_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/heuJKgd/ludo_king_voice_chat_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421768/normal_5ff206e407971.pdfIn PDF document text
    • https://guxovixig.weebly.com/uploads/1/3/5/3/135317997/6d46d7.pdfIn PDF document text
    • http://techanomic.com/8345426629k9c5f.pdfIn PDF document text
    • https://bebadivinokad.weebly.com/uploads/1/3/4/6/134604253/rerosumeve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://neropexuzex.rf.gd/95734670691.pdfIn PDF document text
    • http://gawupuzilolo.epizy.com/daring_greatly_how_the_courage_to_be_vulnerable_transforms_the_way.pdfIn PDF document text
    • http://jokosalona.epizy.com/sugaxewezelosuduniluj.pdfIn PDF document text
    • http://dusetelonuzaj.epizy.com/formcontrol_vs_formgroup.pdfIn PDF document text
    • http://nugonubofatu.epizy.com/best_abraham_lincoln_biography_book.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_off0000ce41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE41 5528 bytes
SHA-256: f00c17f3aa099d9b32f68c16f355077f3b8d8906138d78da14d76a6124e642af
font_01_sfnt_off0000e0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 11524 bytes
SHA-256: 8b3a6912b404ad9bc27c2e530bc93a5dea4f23461a82161d3b7b64671fb2560d

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