Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7db912af48d6bd…

MALICIOUS

PDF

72.7 KB Created: 2021-03-27 20:24:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaf49c4078e8f3a26fd13cabb553f2c7 SHA-1: 760a35131ec997b3ca8655fb97a509870e4343bf SHA-256: eb7db912af48d6bdc3584f8e5d0cc7ab872e711a1647ea792ca2f83d9577a86d
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, suggesting an attempt to direct users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive external URIs are indicative of malicious activity.

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://jumiwimov.ru/123?utm_term=basespace+apps+quick+guide
    • https://static.s123-cdn-static.com/uploads/4366995/normal_5ffa6a14482a4.pdf
    • https://cdn-cms.f-static.net/uploads/4417216/normal_601150fe35d6a.pdf
    • https://cdn.sqhk.co/vikeguzag/iauggig/canada_visa_family_information_form_signature.pdf
    • https://static.s123-cdn-static.com/uploads/4446147/normal_6000a0672213f.pdf
    • https://zijixowopuza.weebly.com/uploads/1/3/4/5/134524639/9813806.pdf
    • https://cdn-cms.f-static.net/uploads/4424025/normal_5fe98060826a2.pdf
    • https://cdn-cms.f-static.net/uploads/4423431/normal_6033506e57fb7.pdf
    • https://cdn-cms.f-static.net/uploads/4370268/normal_605190fdcc2f9.pdf
    • https://cdn.sqhk.co/dufukeraj/cPsafhb/generalized_anxiety_disorder_icd_9_code.pdf
    • https://static.s123-cdn-static.com/uploads/4380700/normal_5fcfefebf1b36.pdf
    • https://cdn.sqhk.co/fuvebopeweb/0phfXgc/most_difficult_games_on_nintendo_switch.pdf
    • https://static.s123-cdn-static.com/uploads/4483365/normal_5ff781cd16a52.pdf
    • https://bikonate.weebly.com/uploads/1/3/4/7/134715396/1782863.pdf
    • https://lekaretuzej.weebly.com/uploads/1/3/0/7/130738752/bixemanopebov_sopelulad_bozoke.pdf
    • https://sefokuto.weebly.com/uploads/1/3/0/7/130738721/5549163.pdf
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/kuriteme.pdf
    • https://cdn-cms.f-static.net/uploads/4451353/normal_6011dfdea1c03.pdf
    • https://static.s123-cdn-static.com/uploads/4420036/normal_5fe1567547997.pdf
    • https://static.s123-cdn-static.com/uploads/4408588/normal_60017fffc7939.pdf
    • https://cdn-cms.f-static.net/uploads/4372101/normal_602a33a816855.pdf
    • https://static.s123-cdn-static.com/uploads/4500877/normal_5ffad30cbc7b4.pdf
    • https://cdn-cms.f-static.net/uploads/4368219/normal_604625d2992a3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000de1e.bin
e1ccb9f0deaa2a51fba49ae04c8b255c7c82fa9e132fd4d90cfe0703740321c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1E 5352 bytes
font_01_sfnt_off0000f064.bin
e1b641a65d49388268865a155c27263463b605bda35308de1e74f1ec8d8ba5d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 10840 bytes

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