Malicious PDF — malware analysis report

Static analysis result for SHA-256 a750774edfd757b2…

MALICIOUS

PDF

76.5 KB Created: 2021-04-08 04:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7d27c8a8b0b5182e30f87644428f5c5 SHA-1: aa879b4edb2e4f8fd4f337e11b3f68a51e3cfbd3 SHA-256: a750774edfd757b28e2a9df744b3db48d422742c0bbc07bea9c6fcbd4f7cdb5e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO link farms and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/award?keyword=bearing+housing+skf+pdf
    • http://zobuzireb.22web.org/fur_elise_piano_sheet_music_with_finger_numbers.pdf
    • http://gomijojupi.iblogger.org/tuzideromowutak.pdf
    • http://jovuzutijokene.iblogger.org/nosavalu.pdf
    • http://tuguxanofa.iblogger.org/calcaneus_haglund_deformity.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bodasubosixo.rf.gd/34498443107.pdf
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_ad8398b6693c42ef8ca4479c127647ce.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a3ea37d2-972d-436d-bc45-750f5906b00d/jusogomezefobajimitune.pdf
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_f18bc72fbe2c486da296bab4c4424add.pdf?index=true
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_88012c1cda1b4255ad1194908f1403bd.pdf?index=true
    • https://s3.amazonaws.com/kaxukok/phet_balancing_chemical_equations_html5_answers.pdf
    • https://s3.amazonaws.com/xesigeze/kenmore_intuition_vacuum_parts.pdf
    • https://s3.amazonaws.com/mefonevimimix/56479071847.pdf
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_65ffe4e6e9954a7c8eaa0ec5c50234ab.pdf?index=true
    • https://s3.amazonaws.com/betefowubevat/wulefodapabuwoxizolegiv.pdf
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_f0f4bce29ebe479a813eac7e3f75c52d.pdf?index=true
    • https://3d636ecf-b5c4-4691-845c-2d501a7a8090.filesusr.com/ugd/b09df1_6f1b66f12ae240c59e7d6e09c40554ee.pdf?index=true
    • https://6c639bf1-704a-4500-b661-329758898742.filesusr.com/ugd/02d620_d1e80b2ef77148a5a6eba1707c27d7d1.pdf?index=true
    • https://s3.amazonaws.com/wotodedaruzuk/11028840137.pdf
    • https://s3.amazonaws.com/tubukeganuji/xawikimixidulamiwa.pdf
    • https://s3.amazonaws.com/loxopudizus/some_basic_concepts_of_chemistry_notes.pdf
    • https://uploads.strikinglycdn.com/files/e77314e8-c740-4d2c-b33d-5c59e1b3155f/the_cat_in_the_hat_knows_a_lot_about_that_full_episodes_youtube.pdf
    • https://s3.amazonaws.com/fikuvine/sbi_answer_key_2019_clerk.pdf
    • https://s3.amazonaws.com/fejenijovekozu/looming_tower_episode_guide.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_off0000edaa.bin
d42eeba5155bd4a9492a7d7a15af1fc05c0ff8d223534dc9091ff4aab6f273c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 5384 bytes
font_01_sfnt_off0000fffc.bin
5ebeaf7ef95a2b647058218bd00635c36c521b6614461408db8d88a9d95b7d61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 10960 bytes

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