Malicious PDF — malware analysis report

Static analysis result for SHA-256 8635e26fbddf76d5…

MALICIOUS

PDF

73.0 KB Created: 2021-01-12 00:31:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a0ef7b7f484245acd83f24e8a4d05b23 SHA-1: e52ef76796d58b2c592f3dd0dcef6d48f8f87de6 SHA-256: 8635e26fbddf76d558f6630ebd7f8ab3c41edc30851d53a35102e2308657f2cc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, indicative of a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded links, such as 'https://trafffi.ru/aws?utm_term=free+printable+palm+leaf+template', are likely used to redirect users to malicious sites or download further payloads.

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
  • 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=free+printable+palm+leaf+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378165/normal_5f91ade19d603.pdfIn PDF document text
    • https://tugarekuxu.weebly.com/uploads/1/3/4/3/134307697/fipaxezikag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378599/normal_5f946847f118f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496586/normal_5fbbd89e3690b.pdfIn PDF document text
    • https://site-1176040.mozfiles.com/files/1176040/eclectic_paradigm_theory.pdfIn PDF document text
    • https://site-1195301.mozfiles.com/files/1195301/jukupivozumipudo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379613/normal_5fd9d93f43fb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389358/normal_5f915c5c2c09f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374024/normal_5f8c7b13d920f.pdfIn PDF document text
    • https://site-1173181.mozfiles.com/files/1173181/crossword_mysteries_season_1_episode_2_dailymotion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501770/normal_5fbf8681332b0.pdfIn PDF document text
    • https://cdn.sqhk.co/tebolugex/gdvesqi/pokisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421207/normal_5fae6ed679e9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460058/normal_5fa7349c264fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381529/normal_5f9a6a4e1ad92.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F8 4964 bytes
SHA-256: bb4cf3625631f49543df71fdb31fcb55c673d5d78ef26f1d24fdbd7c45989dd5
font_01_sfnt_off0000e7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000f04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 11152 bytes
SHA-256: d44e4eca39b977896efc2aa721255a346108b8ff5d1998daf11053c034f885c2

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