Malicious PDF — malware analysis report

Static analysis result for SHA-256 98dcdcb85e5db7ee…

MALICIOUS

PDF

66.0 KB Created: 2020-12-22 23:20:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7287d0660ca37f2c45d96856e8fbe1a SHA-1: 1b3810241f603e81a2fc4687f860b91c966cb6a2 SHA-256: 98dcdcb85e5db7ee7197f0500eeea61649fb2c703b9baff5bbcde0165e2a48cc
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. The PDF contains a large number of external links, many pointing to benign resources, but one prominent link to 'trafftec.ru' suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings indicate it's part of a link farm or redirection scheme.

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://trafftec.ru/strik?utm_term=crayola+scribble+scrubbie+pets+game
    • https://muxupodijem.weebly.com/uploads/1/3/4/8/134885552/kawumumejo.pdf
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/wisobolimuz.pdf
    • https://derodaju.weebly.com/uploads/1/3/1/6/131606282/sijejowa.pdf
    • https://dudikojegak.weebly.com/uploads/1/3/1/4/131406444/bb751ac73e5e51f.pdf
    • https://tudegikugil.weebly.com/uploads/1/3/5/3/135317618/b6d6c1c3c.pdf
    • https://cdn-cms.f-static.net/uploads/4379234/normal_5fb482f21417b.pdf
    • https://cdn-cms.f-static.net/uploads/4417220/normal_5fd7f5cce4156.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tibitexil/free_telugu_movies_sites_list.pdf
    • https://uploads.strikinglycdn.com/files/9adb2736-57b9-480c-91f2-f449ba403e84/tewewameduvawuzutiwev.pdf
    • https://s3.amazonaws.com/tapelu/gibco_cell_culture_basics_handbook.pdf
    • https://uploads.strikinglycdn.com/files/de804901-7e4e-4f3d-8d3d-152062018b77/tilulaxepexutojifaduro.pdf
    • https://s3.amazonaws.com/putelekireza/android_emulator_bluestacks_4.pdf
    • https://s3.amazonaws.com/xeponodij/beep_test_formal.pdf
    • https://s3.amazonaws.com/ditiruz/32011950971.pdf
    • https://static1.squarespace.com/static/5fc2fc780b6b03258f43150d/t/5fc73842b7521d608a41d78d/1606891586818/jamotegis.pdf
    • https://s3.amazonaws.com/zodawanuror/intermatic_timer_instructions_manual_dt300.pdf
    • https://s3.amazonaws.com/vajefam/fafikowajigetoluxekamir.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_off0000c4d8.bin
321547673d75a5dad70375b96c355559980f3f3c9a8f4d5d5c170ad1136e9a9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D8 5400 bytes
font_01_sfnt_off0000d728.bin
9b4155775cc5c7e054eaa4a491b2ff37059723ca9be2ee021eb149452f2aface		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD728 10476 bytes

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