Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4da9a66befee22…

MALICIOUS

PDF

74.7 KB Created: 2021-03-27 14:54:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38907d4f96d120f388e2150264145b29 SHA-1: 5e7456895827faba90b5203ea8d264fccdb25ca7 SHA-256: 2f4da9a66befee226b1a86f7312ad9d34cacc7ab56c8873c259d9bd8294486f6
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a large number of external links, indicating it is likely part of a link farm designed to direct users to malicious websites. The embedded URLs suggest an attempt to redirect users for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=fill+in+the+blanks+story+worksheets+pdf
    • http://nizozipup.22web.org/angielski_dla_pocztkujcych_swka.pdf
    • http://jawowulipo.22web.org/how_much_do_navy_reserves_get_paid.pdf
    • https://static.s123-cdn-static.com/uploads/4481275/normal_5ff2b9e47c5be.pdf
    • https://cdn.sqhk.co/wadalibituge/dUo1MYy/23416926592.pdf
    • https://cdn-cms.f-static.net/uploads/4420037/normal_60380b7f885ce.pdf
    • https://cdn-cms.f-static.net/uploads/4485693/normal_60368245b4fe4.pdf
    • https://cdn-cms.f-static.net/uploads/4378605/normal_600eceb77e7c8.pdf
    • https://cdn-cms.f-static.net/uploads/4450345/normal_6011ca8a4a2f2.pdf
    • https://cdn.sqhk.co/pixisuja/pgfjajf/gakumegita.pdf
    • https://cdn-cms.f-static.net/uploads/4452173/normal_605aa13ab9e3d.pdf
    • https://cdn-cms.f-static.net/uploads/4454556/normal_6018a3fbe0041.pdf
    • https://static.s123-cdn-static.com/uploads/4410415/normal_5fcc4466aaa27.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f3fee330-56c4-432f-a2f7-4c412660c4cc/56319674914.pdf
    • http://zizumanoxiv.epizy.com/asciidoctor_page_break.pdf
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_dd478600266c4b829e9f4bd0d7530076.pdf?index=true
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_8b52290db4b9434ea73f204dcbac5b9c.pdf?index=true
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_4b517f8d7fc44f48805d9c2767675a7d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/759a1d7b-d292-4d27-94a2-2ed44e0f9406/38976515131.pdf
    • http://gexijefepawu.epizy.com/lg_tone_review.pdf
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_f21602ca72954a5baebefd693ae9a875.pdf?index=true
    • 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_off0000e43c.bin
109f00336a4a9fc7f6a2aeea4e94e231950b8016fcf654d64255882f22f58f20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE43C 5484 bytes
font_01_sfnt_off0000f6ed.bin
4ff673807aedffc0d420039cd1af93fd220f705058df34b987c288a340ba3a79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6ED 11604 bytes

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