Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1f596e07cb1618…

MALICIOUS

PDF

77.6 KB Created: 2021-03-01 00:34:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 099713e3509cccf614e50f1111b82e71 SHA-1: e910e25eb000af92ed32b5387cd6a702e91bbb18 SHA-256: bd1f596e07cb16189be4327e11dc0cbec75fda676ac063a02daaf4a10968a514
244 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to disposable domains and redirectors, indicating a link farm designed to distribute malicious content. The primary URL, 'https://crophysi.ru/123?utm_term=troy+bilt+riding+mower+prices', suggests a lure related to product pricing. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=troy+bilt+riding+mower+prices In PDF document text
    • https://cdn.sqhk.co/vakolitakap/ghL2ifc/rerikefegozevewomot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417213/normal_6017a9b3e9701.pdfIn PDF document text
    • https://cdn.sqhk.co/botuvawezej/ghwv21M/driving_car_games_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448094/normal_602d4c8ab37e3.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/UgeigvU/strike_master_bowling_machine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392868/normal_6025efe9e106c.pdfIn PDF document text
    • https://pizeposinejuxow.weebly.com/uploads/1/3/2/6/132695365/sawopepukum_ruvev_xeruf.pdfIn PDF document text
    • https://sixutaxujarupi.weebly.com/uploads/1/3/4/8/134882582/c8215587d088301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391599/normal_5fd61026c3650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404955/normal_601eaa348dc3a.pdfIn PDF document text
    • https://jalusuduzewot.weebly.com/uploads/1/3/1/4/131456012/kisofugojewudib.pdfIn PDF document text
    • https://cdn.sqhk.co/femuzetoj/j5Jjfjg/free_online_homeschool_curriculum_uk.pdfIn PDF document text
    • https://gazobibulome.weebly.com/uploads/1/3/4/7/134775133/8a6cd574.pdfIn PDF document text
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/bamalemugufodit.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezima/gcLFjct/napuzomikix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447108/normal_5ff91e74e8f7a.pdfIn PDF document text
    • https://lafefetakizin.weebly.com/uploads/1/3/2/7/132712235/1567183.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 5464 bytes
SHA-256: afefdda43fffeb5ff040eeb51963f44cd6c4aec2c9345725682db45a60efc8c1
font_01_sfnt_off000103c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C7 10948 bytes
SHA-256: 3445086a59db7524179e75e97add63f9df1feabd148183e5a364a3fad6f6774d

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