Malicious PDF — malware analysis report

Static analysis result for SHA-256 542615ab9e9db767…

MALICIOUS

PDF

78.0 KB Created: 2021-03-19 22:34:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 490f6c95badcb87499edec7bcab050a9 SHA-1: ed039c6406458bd787ec9806d99d1f4bee958fea SHA-256: 542615ab9e9db767a72c8247af8f6c5360722444f2745046fc9050770507ab28
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to obscure domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful sites.

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-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://soxebez.ru/123?utm_term=fannie+mae+foreclosure+guidelines
    • http://mon-cmbretagne.com/575259444916f5t3.pdf
    • https://dojosofezi.weebly.com/uploads/1/3/5/3/135390984/fukebukokafimobif.pdf
    • http://dorightunion.com/mopoxilisokaxofixewavolalo2g1p.pdf
    • https://cdn.sqhk.co/kafufojugure/hyWgcC2/shooting_metal_targets_ricochet.pdf
    • https://dajolulozofupo.weebly.com/uploads/1/3/4/6/134634221/gazixivasazig_pejij_fivipatu.pdf
    • https://pasadaxadug.weebly.com/uploads/1/3/5/3/135390708/kugazar.pdf
    • http://wegansit.space/dijegojuwqr5m.pdf
    • https://cdn.sqhk.co/kapokosop/R6F1ihI/hollywood_story_fashion_star_walkthrough.pdf
    • https://pasadotofeb.weebly.com/uploads/1/3/1/4/131482919/9889005.pdf
    • https://cdn.sqhk.co/jegetito/i0aiicl/edge_lighting_plus_not_working.pdf
    • https://nupinegudoxaxu.weebly.com/uploads/1/3/5/3/135350485/1684634.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/97f14e60-80b2-4da4-9175-e527d0b58693/29293414919.pdf
    • https://s3.amazonaws.com/zufojadibi/wolup.pdf
    • https://s3.amazonaws.com/minabiwa/cucumber_js_output_report.pdf
    • https://s3.amazonaws.com/zonivezada/compound_interest_worksheet_algebra_2.pdf
    • https://uploads.strikinglycdn.com/files/bf955f9a-b62a-4491-a5cb-81de8b8064e9/35416306736.pdf
    • https://s3.amazonaws.com/gumegulaxi/african_wild_dog_eats_hyena.pdf
    • https://uploads.strikinglycdn.com/files/8d82e259-153b-434e-817e-2f2c2a8182d7/86115679416.pdf
    • https://uploads.strikinglycdn.com/files/b26a465d-9879-439d-b03f-e8b5f204b80c/zugiwosubazurufiropud.pdf
    • https://s3.amazonaws.com/zupenafud/86288673959.pdf
    • https://uploads.strikinglycdn.com/files/be999a51-827e-45a7-96bf-1f4be4d54e98/what_do_the_flashing_lights_on_my_router_mean.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_off0000f247.bin
a288f1ba70b42744bee909e3610da803045ed323ded7c8f211580cf3ee40dac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF247 5296 bytes
font_01_sfnt_off00010433.bin
9326ac894c72f7a6f8e5193e958b3e0c60f63701abc3bce541b231435da05457		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 11228 bytes

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