Malicious PDF — malware analysis report

Static analysis result for SHA-256 725f3c43073a132a…

MALICIOUS

PDF

64.0 KB Created: 2021-01-11 19:46:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1abc9595eb5a9953b53809c7ff02472d SHA-1: 9de3c25998103f1b15bc4bf74e4a8190042e3b8b SHA-256: 725f3c43073a132a367ec9d6cfcfa656a24bc74748fedc17de16b480e6c8e95f
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous external URIs, including one pointing to 'traffnew.ru', suggesting an attempt to redirect the user to a malicious site. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a legitimate document, such as a history article, to mask its malicious intent.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffnew.ru/123?utm_term=ideas+and+opinions+author+crossword+clue PDF link annotation
    • https://site-1176507.mozfiles.com/files/1176507/first_world_war_full_history.pdfIn PDF document text
    • https://site-1168500.mozfiles.com/files/1168500/niribijeriro.pdfIn PDF document text
    • https://site-1168447.mozfiles.com/files/1168447/shipwrecked_movie_1980.pdfIn PDF document text
    • https://site-1179563.mozfiles.com/files/1179563/trucos_de_metal_slug_3.pdfIn PDF document text
    • https://site-1178650.mozfiles.com/files/1178650/how_to_cancel_easypay_metrocard.pdfIn PDF document text
    • https://site-1173634.mozfiles.com/files/1173634/pico_iyer_book_review.pdfIn PDF document text
    • https://site-1177680.mozfiles.com/files/1177680/churchill_show_mca_tricky.pdfIn PDF document text
    • https://ruzudafuzozuxu.weebly.com/uploads/1/3/4/8/134847081/zemanasoz.pdfIn PDF document text
    • https://site-1168007.mozfiles.com/files/1168007/rugeguvatum.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/nokileruzaze.pdfIn PDF document text
    • https://site-1166597.mozfiles.com/files/1166597/facebook_app_icon_2020.pdfIn PDF document text
    • https://site-1171591.mozfiles.com/files/1171591/the_battle_cats_pc_mod.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/rirusozo/jokamavasezuneja.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_off0000bfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA9 5188 bytes
SHA-256: 8be64e56744ff7ef78a7de37e7ca8dd00ef6b66f002b09f8b47bb5e970964821
font_01_sfnt_off0000d158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD158 9920 bytes
SHA-256: 04e4633894f87b12f950b442526b3a670516e6c8299a1c27a18d80b9ee33dbe5

Open this report in the interactive analyzer, or submit your own file for analysis.