Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1469c6435a2ee7a…

MALICIOUS

PDF

71.5 KB Created: 2021-05-31 20:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d79cad88143c1a24081e2a1355704df SHA-1: d50ef249f771c8f0a4741a78df22034ed1dc5f9a SHA-256: d1469c6435a2ee7a1121a30bb23a827045f4331b50207c3f4198802157b0b9be
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to SEO-optimized content, suggesting a link farm or content manipulation tactic. ClamAV detected the file as 'Pdf.Phishing.Trojan', and a critical heuristic identified it as a PDF link farm. The document body is heavily obfuscated, but the presence of embedded URLs and the overall structure point towards a malicious intent to redirect users to potentially harmful sites.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/pbw?utm_term=how+to+measure+house+wire+gauge
    • https://cdn-cms.f-static.net/uploads/4480598/normal_600c193911fc5.pdf
    • https://static.s123-cdn-static.com/uploads/4477655/normal_5feed81bb7af3.pdf
    • https://cdn-cms.f-static.net/uploads/4479906/normal_6066d0109060c.pdf
    • https://pazumiwasosum.weebly.com/uploads/1/3/4/8/134892739/a6aa7971b907.pdf
    • https://cdn-cms.f-static.net/uploads/4375716/normal_605c71d0bac7d.pdf
    • https://lawilutimi.weebly.com/uploads/1/3/4/8/134879912/9a30471bbd40b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/38f6d400-e704-4639-85ed-376024bdb9d5/pumepoluwafugupenak.pdf
    • https://uploads.strikinglycdn.com/files/b7b21172-337d-4be8-896f-3585ff39242d/cars_2_the_video_game_pc_requirements.pdf
    • https://uploads.strikinglycdn.com/files/6f705797-71e2-42b0-8d17-fd8b29c2bc53/why_is_jumping_the_broom_a_tradition.pdf
    • http://neruwuk.pbworks.com/f/jemexew.pdf
    • http://tiduxikuve.pbworks.com/w/file/fetch/144421671/shadow_fight_2_special_edition_hack_mod_apk_android_1.pdf
    • https://uploads.strikinglycdn.com/files/8ca2dabe-35d9-4c65-8fbd-e077a6b7a57f/ben_10_ppsspp_game_highly_compressed.pdf
    • https://uploads.strikinglycdn.com/files/435080d0-e14d-4bec-9ffe-ff7bfeebb89c/science_of_mind_textbook.pdf
    • http://fevawigo.pbworks.com/f/cities_skylines_traffic_mods_download.pdf
    • https://uploads.strikinglycdn.com/files/af08d039-5934-420c-a542-c5a0df3d211b/79919913746.pdf
    • http://gatasulupu.pbworks.com/w/file/fetch/144412371/jujakotugofopusabewa.pdf
    • https://uploads.strikinglycdn.com/files/be8f1121-40af-44ed-89b7-e5ec5b9d918b/neneg.pdf
    • https://uploads.strikinglycdn.com/files/f5fc3fd0-0f65-4e7d-ad2d-8c3b3f7df22f/41220961252.pdf
    • http://lekuzax.pbworks.com/w/file/fetch/144418743/romudipakiximakosari.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_off0000d81b.bin
a59869dc57a197d44aafa28e46eb24f66142584cf477f0c0e2509df3069ea58a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD81B 5120 bytes
font_01_sfnt_off0000e966.bin
9bc1d914804fc3abf97c666f1f7f1bf97c7c4f7a8b81bd479562f25a5fe18659		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 10988 bytes

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