Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e19988bb693418a…

MALICIOUS

PDF

91.9 KB Created: 2021-03-20 15:50:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7d32d6861129145322837edd84ebc08d SHA-1: 647af7225593e5f333d5619c31a7e73e00e82b2c SHA-256: 7e19988bb693418a7eeaf08d3973f0e1947fa12d48a57c98e558b42e01acd41b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/123?utm_term=airplay+android+tv+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415526/normal_6015aaa36524f.pdfIn PDF document text
    • https://cdn.sqhk.co/lojenozasila/3Michgw/54262785552.pdfIn PDF document text
    • https://cdn.sqhk.co/solijisivono/IiVgcXQ/everlast_ball_bearing_jump_rope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_6039243d19bfe.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/fs5Fgcx/sonic_the_hedgehog_galaxea_coral_care.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/software_update_failed_on_ipad_2tpjra.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/nejb7qZ/babylon_bee_store.pdfIn PDF document text
    • http://cethq.xyz/xokomavakukaf3pv0.pdfIn PDF document text
    • http://wirelessinfo.ru/xigovubumatirikaweruzbucj7.pdfIn PDF document text
    • http://cardio-natural.info/navy_blue_raincoats_mensa1r1g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374840/normal_5ff967903f30c.pdfIn PDF document text
    • https://cdn.sqhk.co/rizuwevize/ejfspdA/ielts_listening_vocabulary_words.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502833/normal_60314989bd783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387933/normal_60266acfbd842.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_a4d75f3caadb4d9f85fe99144d51f43a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazutun/sadexunenibulosebupi.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/cms_sepsis_guidelines_2016.pdfIn PDF document text
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_abef0384ae4b4679a7098e9b30a33714.pdf?index=trueIn PDF document text
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_0d58a8dfb18d4fcbafee29d5ee5b6698.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/binary_tree_java.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_off00011665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11665 5444 bytes
SHA-256: 1d1df8aa3489f237610b33038f30ef3256cdd7ae48db6d7e597ae33afa3a3ed0
font_01_sfnt_off00012909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12909 18004 bytes
SHA-256: bbe191224b1b47a35a85b1ed5fce5206e74b014de69e191b78db3f0479751ae9

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