Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a93a2e9df3be09…

MALICIOUS

PDF

79.2 KB Created: 2021-01-15 20:02:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3dbe03eb28a706c8975df9da18000e8d SHA-1: a4513ee41b2d2cde6e2c3ea82394019120ab8d6a SHA-256: 81a93a2e9df3be093783df9dbd80361e42129ac0f920eb8354b224d135e30167
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of embedded external links, suggesting a link farm or phishing attempt. The primary URL, 'https://trafficel.ru/wb?keyword=mech%20arena%20robot%20showdown%20early%20access%20mod%20apk', appears to be a lure for potentially unwanted content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely related to driving traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://trafficel.ru/wb?keyword=mech%20arena%20robot%20showdown%20early%20access%20mod%20apk PDF link annotation
    • https://site-1178153.mozfiles.com/files/1178153/62274016781.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/OjhOibh/colors_that_go_well_together_in_home_decorating.pdfIn PDF document text
    • https://xasuvakem.weebly.com/uploads/1/3/4/4/134400919/760241.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/cjagfC7/55686513878.pdfIn PDF document text
    • https://vetovevigu.weebly.com/uploads/1/3/4/4/134486276/b02a4.pdfIn PDF document text
    • https://cdn.sqhk.co/punenekebi/OIcha42/beludeveziro.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/ggu72ii/31730633045.pdfIn PDF document text
    • https://gutamunimidujad.weebly.com/uploads/1/3/4/6/134667749/roduforusufazo.pdfIn PDF document text
    • https://site-1177423.mozfiles.com/files/1177423/crossword_mysteries_episode_2_cast.pdfIn PDF document text
    • https://site-1241869.mozfiles.com/files/1241869/stack_color_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/9L7pn4t/run_race_3d_appvn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B6 5716 bytes
SHA-256: f9f47d4bf2eb004e731dcbcb59178b30aa31387b6bceaa878660ed4b297b7b68
font_01_sfnt_off0000f616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF616 10496 bytes
SHA-256: 48ca16ce631244af5a1f5a18ae0ac0ed72435c31d07f71ec2b74f98ee0a57892
font_02_sfnt_off00011a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5C 16144 bytes
SHA-256: 26cbe8d54930a3e70f1041da313248e211a7a2e81cc4499e9bc0cdd19cb09a63

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