Malicious PDF — malware analysis report

Static analysis result for SHA-256 495f4055a45f3316…

MALICIOUS

PDF

71.2 KB Created: 2021-04-21 12:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c458a56728ae5ed97cdea6d7e67656c7 SHA-1: 1ac2b4fcb70732aee138e021d572ca022cfb0d39 SHA-256: 495f4055a45f33163bb96da2f9ce3b16d9332964ca2cf69dfac5e72edf9229bf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high number of embedded URLs pointing to disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/strik?utm_term=kawasaki+bayou+220+value PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452834/normal_6021eb9348179.pdfIn PDF document text
    • https://gofutetawavoror.weebly.com/uploads/1/3/0/8/130874623/fozeto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385436/normal_605641e6a574d.pdfIn PDF document text
    • http://tavaxibewoposo.iblogger.org/nunatuxugegokavujokabe.pdfIn PDF document text
    • http://rte-ita.fun/hp_probook_6540b_i7_specsbji9z.pdfIn PDF document text
    • http://xaritilufowav.22web.org/2020_calendar_manorama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_600d571d740bc.pdfIn PDF document text
    • http://ranking-se.com/standoff_meaning_in_urdu_easykn5ew.pdfIn PDF document text
    • http://kokilubowo.22web.org/auditoria_forense_peru.pdfIn PDF document text
    • https://papenuxid.weebly.com/uploads/1/3/0/8/130874395/b362c0028850f.pdfIn PDF document text
    • http://ludshop.xyz/82732147057k4vjg.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/37329711459.pdfIn PDF document text
    • https://zelelifejoba.weebly.com/uploads/1/3/4/3/134321633/polovo.pdfIn PDF document text
    • https://xelinibi.weebly.com/uploads/1/3/0/7/130739371/gabegikesexa.pdfIn PDF document text
    • http://libuwapuvewipev.mywebcommunity.org/abrsm_violin_books.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478137/normal_6055503f1d867.pdfIn PDF document text
    • https://kerutefabiwemek.weebly.com/uploads/1/3/0/8/130874269/warojolegetubisivero.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kavalukato/how_to_fix_ac_blower_motor.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/how_much_is_jas_prince_worth.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/free_online_dictionary_app.pdfIn PDF document text
    • http://zegiwewezenaro.myartsonline.com/another_word_for_bringing_back_memories.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/74840838284.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_off0000d8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F0 5284 bytes
SHA-256: 04c4b4329e1d8aa18a442750c2cc2e6375dd9ec85e078e6b1b173cdc5a8225e4
font_01_sfnt_off0000eb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1E 10560 bytes
SHA-256: b34533861b5afd6f60672c5ae67b077db97cd4c72b57380f00d1939404ad5b00

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