Malicious PDF — malware analysis report

Static analysis result for SHA-256 101df93428a6c272…

MALICIOUS

PDF

72.6 KB Created: 2021-03-23 18:37:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d80a044ac5b0824a3a857a02533e3e53 SHA-1: d8a9374725fff97f17b6446bf7e487b4874d9716 SHA-256: 101df93428a6c2729565ae15066ae8d83bd72375a7bd357faa8e01a672a0fc65
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one pointing to a potentially malicious URL, suggesting it's part of a link farm or phishing campaign. The document body, though heavily obfuscated, contains metadata that may be used to disguise its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/wix?keyword=coloring+dna+answer+key
    • https://gulekikafosevog.weebly.com/uploads/1/3/2/3/132303175/dfaa469266054.pdf
    • https://xomikevogonenoj.weebly.com/uploads/1/3/4/7/134743799/08e3814.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fatikonavori/repinojux.pdf
    • https://uploads.strikinglycdn.com/files/9ff9cdd2-2e70-4ca8-afc6-8d988343d07f/fiwegedalabuzakari.pdf
    • https://s3.amazonaws.com/sumesawoxajew/wugixuvomadotari.pdf
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_0496a674745c492bb7164bb569833390.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2d837c9d-542f-4052-bd44-740e14982d86/21896369268.pdf
    • https://uploads.strikinglycdn.com/files/62db4644-4006-4627-84ed-3579926ab394/song_of_solomon_chapter_2_verse_3_meaning.pdf
    • https://uploads.strikinglycdn.com/files/9ea7c7b6-7e53-4894-a12f-b4b9045d54db/toefl_essay_topics_list.pdf
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_259035f23ec7489cb1714e3ecc917cc4.pdf?index=true
    • https://s3.amazonaws.com/sepovutapakogaf/after_virtue_summary.pdf
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_8334d46ca3d84559bf6ee88e53630f40.pdf?index=true
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_891d7dfbcb73407a8c266066867d0e65.pdf?index=true
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_dbde7f3dc69442828eb74ed8270209b7.pdf?index=true
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_e7c63511ae24415e92007fed13d3f6c3.pdf?index=true
    • https://s3.amazonaws.com/falejogajir/what_is_the_salary_of_aircraft_maintenance_engineer_in_india.pdf
    • https://uploads.strikinglycdn.com/files/bae7fce0-b741-4aa5-af04-dd6f8176c6c9/covalent_bonding_practice_problems_worksheet_answers.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_off0000e205.bin
6ef57cb40f0db0e0f95dd7f81cb1f7cc9ade2f62da4452f72bbd619755f66e40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE205 5156 bytes
font_01_sfnt_off0000f3b3.bin
34361be222dd4359895396f2793897dc82f32f70138ce142a33082db99cc5c21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 9916 bytes

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