Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ce5c714059e2d5…

MALICIOUS

PDF

85.8 KB Created: 2021-05-29 06:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d4506f922f5b4f8b879f8b66297dffc SHA-1: 2140997a07e18b30a426c29e3565fb1361fff559 SHA-256: 38ce5c714059e2d5df8f30d0847146a35dd8c317bf88be3224eb044fc2ba68d9
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be related to product search terms, likely a lure to encourage clicks on the embedded malicious URLs.

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-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://gimoguvi.ru/wb?keyword=cva%20wolf%20stainless%20with%20scope%20mount
    • https://static.s123-cdn-static.com/uploads/4485822/normal_5ff06cfd5a5e1.pdf
    • https://gupekuvexo.weebly.com/uploads/1/3/4/6/134610658/zarewubavusub.pdf
    • https://kuvovoturuja.weebly.com/uploads/1/3/5/3/135322548/3018078.pdf
    • https://tigidebo.weebly.com/uploads/1/3/4/7/134740117/zefiriredojesuvaxuni.pdf
    • https://jowesezowu.weebly.com/uploads/1/3/4/3/134366841/muwafomalojinum_povadif_kibaz_kimuki.pdf
    • https://cdn-cms.f-static.net/uploads/4367633/normal_606c5711388f5.pdf
    • https://samunilita.weebly.com/uploads/1/3/4/7/134709343/2124168.pdf
    • https://ponuxarazuzega.weebly.com/uploads/1/3/5/3/135328107/4683954.pdf
    • https://cdn-cms.f-static.net/uploads/4446289/normal_5fd309301e5ab.pdf
    • https://cdn-cms.f-static.net/uploads/4424647/normal_6015831d9f7cf.pdf
    • https://puxonuge.weebly.com/uploads/1/3/1/3/131383548/padezojegalor.pdf
    • https://static.s123-cdn-static.com/uploads/4424935/normal_60038346eeb28.pdf
    • https://static.s123-cdn-static.com/uploads/4462974/normal_5ffd4cd1726ac.pdf
    • https://cdn-cms.f-static.net/uploads/4497081/normal_605162045e096.pdf
    • https://cdn-cms.f-static.net/uploads/4451567/normal_6037bd97d271a.pdf
    • https://static.s123-cdn-static.com/uploads/4416811/normal_5fef70754c50b.pdf
    • https://cdn-cms.f-static.net/uploads/4417029/normal_602e65764f3b8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9fd62f86-a462-4ebd-8c7d-b977f55bb67b/78470055080.pdf
    • https://uploads.strikinglycdn.com/files/efdc5614-de51-45c5-9333-ef52d812bf41/are_there_any_problems_with_macos_catalina.pdf
    • https://uploads.strikinglycdn.com/files/ea9d126d-9f53-4b34-a11d-6e44ed6bfb5a/71216268140.pdf
    • https://uploads.strikinglycdn.com/files/ee7ee78f-36fb-4231-8413-aaa217852cd5/hp_laserjet_3015_printer_cartridge.pdf
    • https://uploads.strikinglycdn.com/files/62032c5d-3e53-4f74-82aa-77db72dd259e/white_fang_part_1_chapter_3_summary.pdf
    • https://uploads.strikinglycdn.com/files/cda26cf9-e680-4f2a-b28a-630b4356db15/4_types_of_culture_handy.pdf
    • https://uploads.strikinglycdn.com/files/f19bbfdb-e5eb-4cf1-a37c-a3c5efd94d5e/92308951390.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_off00010df2.bin
48041eae7a11b87217ef28abf0a260ad0536b02cf66f342cc460473036cca1d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF2 5216 bytes
font_01_sfnt_off00011fa9.bin
6f77ca55ab8b4b814b0a8257c1c49699e22b4e5873c4c5da32bc4a23338bd3b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA9 12500 bytes

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