Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d4bc6a4fd909d8…

MALICIOUS

PDF

80.7 KB Created: 2020-12-17 00:52:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: df6959360b9ab5ecbd6e872634e74a80 SHA-1: 8bfdc91fc98766b41deb9a95e408286e7f71a01a SHA-256: c5d4bc6a4fd909d81b83cdb94ece76b00060fe801f362a53d328e1df9f888311
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://trafffi.ru/aws?utm_term=class+9-+10+biology+book+pdf', which is presented in the context of a biology book. ClamAV and ML classifiers also flagged this file as malicious, indicating a phishing or trojan-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/aws?utm_term=class+9-+10+biology+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f88b3c89850d.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/wabuvavinilexe_tisipojosare_porufibavuga_laxap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419827/normal_5f9c273ba4cdd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f638e18-16fb-40a8-8636-74da81e6d690/84905972054.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54446bda9c57a97daf394/t/5fc95d79e42a475741d27a9c/1607032185924/la_reina_del_sur_3_actores.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5922424b06a7eb31f4865/t/5fcd5be905ddc9599d32c860/1607293930483/lullaby_for_babies_to_go_to_sleep_mp3.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcf620e665af30590bf9da4/t/5fd6685a3ebe04163160bd30/1607886939588/beautiful_flowers_in_the_world_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe2cc69b1ed03538a4eade/1606298825000/avast_secureline_vpn_license_file.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4dcc35687f52b6b9a9a8f/t/5fce1241f94b6402b2413568/1607340610309/murder_mystery_dinner_game_for_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/349da554-d046-432c-8894-c01af664cec1/nokia_bl-5c_battery_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2340bcc5-f6c5-4235-a48b-c06d6e044323/31090952352.pdfIn 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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC19 5704 bytes
SHA-256: d699f7211a9a2d995c95fa7334f08c0589b563f7db130ca02b9677a40ec7569f
font_01_sfnt_off0000dfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA0 16564 bytes
SHA-256: 141d2e7d8679eb3d97d09f0d9fc7cda2b6c57dadc1aa3d5d43877ed139a6b10a
font_02_sfnt_off000111d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D6 10468 bytes
SHA-256: e06bb9bbdb6d001f9cff7a23454d14d076ef0863f47ec06286202599cbe77a4c

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