Malicious PDF — malware analysis report

Static analysis result for SHA-256 dadc57d41d46fab5…

MALICIOUS

PDF

74.8 KB Created: 2021-05-27 22:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b232c2122fee00de1e958373996dcf53 SHA-1: d3f9daa2a5d428092b1b2b91230b754e2bbfda7d SHA-256: dadc57d41d46fab5265b9b8269042f14510ce2cf3bc04277b2bb03823248473b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, including one to 'lozipotod.ru', suggesting a phishing or malware distribution attempt. Heuristics indicate a link farm and a fake invoice lure, supported by the ML classifier and ClamAV detection. The presence of embedded PDF objects and external links points towards a potential exploit or a malicious redirect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/123?utm_term=avast+2018+free++windows+10
    • https://cdn-cms.f-static.net/uploads/4417221/normal_606e5c3a85394.pdf
    • https://static.s123-cdn-static.com/uploads/4451028/normal_5ffbd39683011.pdf
    • https://vogobozonek.weebly.com/uploads/1/3/4/6/134667402/menumuwek-gaxuri-bunotaxo.pdf
    • https://wadomojare.weebly.com/uploads/1/3/4/4/134472746/9290453.pdf
    • https://nitowapesapu.weebly.com/uploads/1/3/4/4/134442046/kosijer-zebab-xixona-zeguwudarejovat.pdf
    • https://cdn-cms.f-static.net/uploads/4423429/normal_6040a67e6a469.pdf
    • https://wasizizinawuj.weebly.com/uploads/1/3/6/0/136096362/duxuvuximipot.pdf
    • https://static.s123-cdn-static.com/uploads/4419413/normal_5ff406bec3fdf.pdf
    • https://cdn-cms.f-static.net/uploads/4402247/normal_60297963d7445.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dd6395c7-778a-401d-bd5a-d7edf834c44b/visizisur.pdf
    • https://uploads.strikinglycdn.com/files/f3f4252d-52df-45d7-90a9-78e434820287/sanemoz.pdf
    • https://uploads.strikinglycdn.com/files/ee8d171a-2eab-4ede-9dd7-ad247d9b111d/sededevipefeve.pdf
    • https://uploads.strikinglycdn.com/files/681b4361-70b5-4d47-a90a-6f22d17d7b7c/ludelepiwirudi.pdf
    • https://uploads.strikinglycdn.com/files/15db6b18-8811-49ee-af09-3476ff5831a2/30_seconds_board_game_rules.pdf
    • https://uploads.strikinglycdn.com/files/1799a460-4401-4850-839d-8eaf8419c726/15649477143.pdf
    • https://uploads.strikinglycdn.com/files/65b99bba-f449-4a40-bdbb-7733dc1f7e89/challenge_war_of_the_worlds_2_episode_11.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_off0000e4f9.bin
813da943fb508b0a9653f73b1d3ff40bb99cea8c2dbb3fadd9eb320db881bfa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F9 5528 bytes
font_01_sfnt_off0000f7f8.bin
3ee8438f2b4b6ab1f92fc6f80b94ee0b34754f207e489f909dad3114bf53ee35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F8 11284 bytes

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