Malicious PDF — malware analysis report

Static analysis result for SHA-256 affc5d8e69d778e3…

MALICIOUS

PDF

68.7 KB Created: 2020-12-18 08:46:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0fb41c93246014247bcfabac9eb2b870 SHA-1: 8194f59eecb9eb9a85dd457495628c0b71e6dedb SHA-256: affc5d8e69d778e3228ea93746a91c242934d235368be68be778a1dc6e663cc8
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains strings that appear to be lures for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=holy+paladin+classic+wow In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384471/normal_5fbf69d7eb9d1.pdfIn PDF document text
    • https://jikajulimag.weebly.com/uploads/1/3/4/3/134319013/kujiwifoxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369919/normal_5f970133454b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pilazi/latest_malayalam_movies_link.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc55280ab79f442f246e36a/t/5fc60ee91972c46e3c6dedf0/1606815465869/96580399109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a67ffe78-c16d-4d95-8372-c5e6c95c3794/22958711691.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc12df85bcb0228a284406c/t/5fc34f06145a8629dc1ad55b/1606635270568/the_rock_wwf.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/8381325004.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc56483e2fce462bca9f74e/t/5fcd429bcded405bb8e5c067/1607287454730/drift_away_uncle_kracker_piano_sheet_music.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce39cd98f154499f361b13/t/5fd6e53772b1137fa9894c8b/1607918904671/ordinal_number_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/40749701415.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc58b7f104edf1d77a09da7/t/5fd5f409154d727871e066cc/1607857161974/76947503069.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/bsa_medical_form_part_d.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74cbc707-bd3a-4144-aa84-d7d27ca0eee0/93252619111.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc14581c89e1c4b8fc0e725/t/5fca44249c93c058c490663c/1607091236927/68623946060.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/stages_of_conflict.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfda27a5bc066edf9fc50f/t/5fcdb8dd2bc7884852d3c4d1/1607317725635/buzzer_button_for_games.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD176 5128 bytes
SHA-256: 99d220bfe73eb22d5ff7f28b44a090a90d92aa0146e2a558c11faa322b4ecb4e
font_01_sfnt_off0000e315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 10184 bytes
SHA-256: 3d52ac450971f2e537b7571099c82d9c67b65bbb934f657ec4b307961bf501a6

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