Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3c59bee4c01d8c…

MALICIOUS

PDF

90.1 KB Created: 2021-02-20 23:27:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 00218570d6289ab18d356190319197ac SHA-1: 70733a0afa99e9ddf5ea182592aab0aaf8302aa1 SHA-256: 4e3c59bee4c01d8cb39d220eaf1ca7b9768f5b30316b3bf6d930d9f1b9c80605
186 Risk Score

Malware Insights

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

This 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 a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of numerous external links and the overall structure strongly indicate an attempt to lure users to phishing or malware-hosting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/123?utm_term=neural+network+matlab+code+for+classification PDF link annotation
    • https://cdn.sqhk.co/pijavagoke/hwhavhf/my_verizon_mobile_app_login.pdfIn PDF document text
    • https://poxemolefefax.weebly.com/uploads/1/3/1/4/131407365/b74fbeab35.pdfIn PDF document text
    • https://zebomutob.weebly.com/uploads/1/3/2/6/132696512/fazowosudaxujon-gadobubirafo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_602cdd7d37579.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzijaxab/79iaSgd/gikovozepojezovokisaz.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/enhilfD/pisulu.pdfIn PDF document text
    • https://zijobukevas.weebly.com/uploads/1/3/1/4/131454580/xuwaje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444852/normal_600ca2b96a56b.pdfIn PDF document text
    • http://robot3.site/56370644071sujva.pdfIn PDF document text
    • https://kedifekutijita.weebly.com/uploads/1/3/4/7/134713117/fofagizakegukiv_lodolovifotez.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwuzuwix/cXeUJMc/tear_her_clothes_apk_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453550/normal_5fd62874642f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/fezijurejo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DF 5316 bytes
SHA-256: 726b7ab2103a8b1c4c5d84b63f273e0de9410c1ffcd6bf9a94164d0ba926f475
font_01_sfnt_off000107ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EA 1964 bytes
SHA-256: 1d18534733479c870a78c46a90b83ed8aff410c3511f6838c5b83347f92bfa48
font_02_sfnt_off00011144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11144 11012 bytes
SHA-256: dd6574b5ed49fd8c546b43b1285fe6bfeaae93f64b32077200c92209c6a893d4
font_03_sfnt_off00013725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13725 16132 bytes
SHA-256: 82f7aa4fef2cd90733ed84ef1d81c041b15990b82a49830089245cc24b586ea2
font_04_sfnt_off00014c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C15 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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