Malicious PDF — malware analysis report

Static analysis result for SHA-256 3619f2244b9fd518…

MALICIOUS

PDF

78.1 KB Created: 2021-03-30 14:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aed71d38b012bb6d1a2bd3157d7aa07f SHA-1: 9cd3e6008f73a03466b56f7810f9e2c44fd20ac3 SHA-256: 3619f2244b9fd5180e5fa3c431a5d332b6ac5f752c3580897c07e8bb8ddb3d00
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains a large number of external links, many pointing to suspicious domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains text related to 'My cloud desktop pc', which is likely a lure to direct users to malicious URLs.

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-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://fokemale.ru/strik?utm_term=my+cloud+desktop+pc
    • http://fukoramilani.22web.org/9404503428.pdf
    • http://sufawevugut.mywebcommunity.org/8435631710.pdf
    • http://mixutadumekaje.mypressonline.com/7421600672.pdf
    • https://pawasisuleti.weebly.com/uploads/1/3/4/6/134652657/zavenilalewanuv.pdf
    • https://dukopovofozevi.weebly.com/uploads/1/3/5/2/135295758/zowizibakatujimi.pdf
    • http://semowatuk.iblogger.org/35840869288.pdf
    • https://cdn.sqhk.co/porekige/oggX4Gz/tennessee_titans_game_schedule.pdf
    • https://luletifolavok.weebly.com/uploads/1/3/4/3/134369244/986d9838b39c.pdf
    • http://jixazepo.mywebcommunity.org/appsc_group_1_syllabus_download.pdf
    • https://cdn.sqhk.co/guzunilepin/iFt4jfy/41372552637.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0c02e4f6-74a8-47af-9deb-394ba9986e2f/massey_ferguson_parts_manuals_free_download.pdf
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_e2cd5fcfd84243dfb5f54d4072637b55.pdf?index=true
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_f6ec3361d6124f9799e4c69250b254f4.pdf?index=true
    • http://xeroxuzowi.epizy.com/apa_bulleted_outline_format.pdf
    • http://wufuxoponuwuros.epizy.com/dowry_prohibition_amendment_act_1986.pdf
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_abffd63ed9b74ac5ad4acc731d909f33.pdf?index=true
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_a5909602b4a3413bb81a5da529171ca2.pdf?index=true
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_df050141ab71481cb3bb16c425787d76.pdf?index=true
    • https://uploads.strikinglycdn.com/files/21b1551e-91d7-4d54-a3fb-d542efbde75d/delokedujizonizuko.pdf
    • http://fobewejidopiwu.rf.gd/66919067005.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_off0000f39c.bin
24f5becfaa81c36a469dfeffe01bb7a45a6e7ef2a147f60ea03e663be53c47f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 4932 bytes
font_01_sfnt_off00010492.bin
1a5419db126a76bf186c58999c1ddf746c1fdb72d8db77c816c0cc20e734748d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 10956 bytes

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