Malicious PDF — malware analysis report

Static analysis result for SHA-256 5caa27c0f5ed2c3c…

MALICIOUS

PDF

67.7 KB Created: 2020-11-21 04:43:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22aa12d9e4bb0d359a268e25dc0a05f8 SHA-1: 79b17d3189d6667e7a423709e43609a7beff1246 SHA-256: 5caa27c0f5ed2c3c7bb05902cb96c1bc238b7b6e18dbacec71b58c1aa1646bde
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious or unknown domains, indicating a link farm designed to redirect users to malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://cctraff.ru/123?utm_term=auto+body+flat+rate+manual
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/vowesiw_sunifanosepuso_bokituve.pdf
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/a3b553f00eef.pdf
    • https://luvepuxoworusoj.weebly.com/uploads/1/3/4/6/134660421/kodinukiwekijobafis.pdf
    • https://goxezojukaruvuk.weebly.com/uploads/1/3/4/0/134000107/winavowuwis_pokek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/56fbe31d-a40f-4a53-bb43-a49db6922c49/unblocked_games_stick_fight.pdf
    • https://s3.amazonaws.com/rovikibixu/7866017815.pdf
    • https://uploads.strikinglycdn.com/files/d359f524-013a-42bb-a9fd-a24e3e35e5bc/78845212312.pdf
    • https://s3.amazonaws.com/wolina/nec_2020_changes_ppt.pdf
    • https://uploads.strikinglycdn.com/files/bd0e24da-30b8-43c3-bb77-76007ecf85e4/53185959941.pdf
    • https://uploads.strikinglycdn.com/files/8aa4846b-61d6-476c-a282-244d7a3ff259/40705630196.pdf
    • https://uploads.strikinglycdn.com/files/b1d82403-5a2c-4efa-b747-20580098a68c/63291406605.pdf
    • https://uploads.strikinglycdn.com/files/34e461df-37e2-4a23-a412-de72fa4a954a/eotriceratops_dinosaur_simulator.pdf
    • https://uploads.strikinglycdn.com/files/c6ad2a6c-5a5f-4bee-98b6-50b13d9235c3/leviathan_dreadnought_base_size.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_off0000cc40.bin
b8c215ad057619ba69d72852b070c3da840eb0595752770ed22a530285c0429f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC40 5108 bytes
font_01_sfnt_off0000dd92.bin
42efae3330ebcd18fcf5f7cc535c66907975e1add9d46a981d9c78814211ef60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD92 10376 bytes

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