Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff18a4d390439584…

MALICIOUS

PDF

67.6 KB Created: 2020-12-21 04:54:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cdb0dedd0f683b2873851fb578cd625 SHA-1: 90bc3c43f75e7251473f8eff638c5107c0e45878 SHA-256: ff18a4d390439584180f267ef12fef7a577b77d50e8a7c757338fc6a6ef339a0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO link farms or to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URL `https://traffking.ru/aws?utm_term=free+spanish+english+dictionary+pc` is likely the primary destination for the attack, disguised as a free dictionary.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/aws?utm_term=free+spanish+english+dictionary+pc
    • https://jisogixisizula.weebly.com/uploads/1/3/4/3/134328009/6045511.pdf
    • https://xafudilolara.weebly.com/uploads/1/3/4/7/134744509/pujidalonilulo.pdf
    • https://xawuwotogot.weebly.com/uploads/1/3/2/6/132695388/pamijutafilinud_dodolamu_vipububemad_wofenira.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0ef88702-702d-41ea-958a-385a4c03248f/dizi_indirme_sitesi.pdf
    • https://uploads.strikinglycdn.com/files/993b793d-b035-4206-95e8-fe1f5b5d48a2/37330720210.pdf
    • https://s3.amazonaws.com/bisegilupuf/100_dollar_payday_loans_online.pdf
    • https://s3.amazonaws.com/jadere/56563162262.pdf
    • https://uploads.strikinglycdn.com/files/563983fb-b89d-4fb7-9412-a126bba0a01a/the_basic_practice_of_statistics.pdf
    • https://s3.amazonaws.com/purixifusipelid/sunugikimudu.pdf
    • https://uploads.strikinglycdn.com/files/1120edfe-2901-4fff-91b3-21fad149d0b3/flying_dream_meaning_hindu.pdf
    • https://uploads.strikinglycdn.com/files/3803d83c-811d-44fd-960c-02968762097e/pearls_peril_guide_and_gifts.pdf
    • https://s3.amazonaws.com/xoferuzu/post_training_evaluation_form_templates.pdf
    • https://uploads.strikinglycdn.com/files/866020e3-6f11-4d33-81cd-82fdcd79b8b1/ropilerunizujobur.pdf
    • https://s3.amazonaws.com/wilugugo/63499792753.pdf
    • https://uploads.strikinglycdn.com/files/47f46752-14b4-4ff7-85b8-ea5951da97fa/what_level_does_swinub_evolve_in_pokemon_leaf_green.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_off0000cc92.bin
eaaee3bf4b92c937613c67418f7794a1cb86a01d858d98a54d812294b5d52f13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC92 5392 bytes
font_01_sfnt_off0000deed.bin
8397fe948818c6aceb7cb19a2f089c37570dd6c37b58b5796c8019166d554561		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 10200 bytes

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