Malicious PDF — malware analysis report

Static analysis result for SHA-256 756f8844dcbef2a2…

MALICIOUS

PDF

76.8 KB Created: 2021-03-24 03:49:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce9a3b5cdf6882a16ec1e0090d51ac56 SHA-1: 70779156160efe08bfacdb897db8eb534c162c42 SHA-256: 756f8844dcbef2a29325213aab33d668934901631055d26120b402cf5f63081e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'link farm', with one prominent URL pointing to 'resalured.ru'. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/123?utm_term=algebra+1+math+worksheets+pdf
    • https://sugasukeni.weebly.com/uploads/1/3/4/8/134878852/fesujul.pdf
    • http://workmonster.net/najonalerojawematibofobocrsoc.pdf
    • https://cdn-cms.f-static.net/uploads/4481278/normal_6048c4f65b92d.pdf
    • http://fherixq.com/htc_m8_factory_reset_not_working4etp7.pdf
    • https://cdn-cms.f-static.net/uploads/4427821/normal_6056f4535e195.pdf
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/guzawasuku.pdf
    • http://com-servers.online/crossroads_mall_bellevue_hourscjp97.pdf
    • https://lijarodamuvoraj.weebly.com/uploads/1/3/4/4/134456910/sizukavonosa.pdf
    • https://cdn-cms.f-static.net/uploads/4373004/normal_6021aae10adf3.pdf
    • https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/fuvofa.pdf
    • https://xazulifego.weebly.com/uploads/1/3/4/7/134727283/5632426.pdf
    • http://usechambre.xyz/harry_potter_and_the_sorcerers_stone_chapter_1_discussion_questionsbj83b.pdf
    • https://cdn-cms.f-static.net/uploads/4424996/normal_5fd65a7a4038a.pdf
    • https://wazaxilam.weebly.com/uploads/1/3/4/7/134726650/282039518dbe200.pdf
    • https://bapixive.weebly.com/uploads/1/3/4/3/134393773/kivarozo-nipibi.pdf
    • http://mon-cmbretagne.com/suntrust_mortgage_payoff_mailing_addressdvmnb.pdf
    • https://mobugozuko.weebly.com/uploads/1/3/4/8/134869294/laniwutuwod.pdf
    • https://mitojebani.weebly.com/uploads/1/3/2/7/132711961/jebuzobuminamivepu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gotenukevepunin/criminal_law_case_study_examples.pdf
    • https://s3.amazonaws.com/vedexajawo/acronis_true_image_2017_mac.pdf
    • https://s3.amazonaws.com/dedinavesute/88404156369.pdf
    • https://s3.amazonaws.com/sojaxub/abstract_nouns_worksheet_for_grade_8.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee84.bin
a05ebb3965ad61f4df2b45c388edadf13e85cec531c10a03abba25d64db70963		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 5792 bytes
font_01_sfnt_off00010229.bin
8c86e4b631033fc0f4c28bccbc0eeaa0f55536739f10a2c360a1f17a7ab49a04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10229 10580 bytes

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