Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1282084188f0c5…

MALICIOUS

PDF

62.2 KB Created: 2020-11-18 02:14:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 510f0513e16ec25aceb6d41d0db238a1 SHA-1: 7b365f565012b68c7a4bedf52197c07e28dc6996 SHA-256: 2a1282084188f0c5d5267f109df2a8659d316aa180dc36b318f4a55d2c3183c6
154 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to a known malicious domain, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, suggests a lure related to a 'Stihl fs 56 rc owner's manual'. The ML classifier and ClamAV detection further support its malicious nature, classifying it as phishing and a trojan. No scripts were extracted, but the primary attack vector appears to be directing users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/123?utm_term=stihl+fs+56+rc+owner%2527s+manual
    • https://cdn-cms.f-static.net/uploads/4370073/normal_5f898a3283cd6.pdf
    • https://cdn-cms.f-static.net/uploads/4474192/normal_5fa75944d6627.pdf
    • https://cdn-cms.f-static.net/uploads/4448357/normal_5fa6ac3501338.pdf
    • https://cdn-cms.f-static.net/uploads/4471092/normal_5fad4fef59960.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/foneniz/81374402036.pdf
    • https://s3.amazonaws.com/fofeguj/dikeduwovuzejasatuver.pdf
    • https://s3.amazonaws.com/ribowexulo/123movies_app_ios.pdf
    • https://s3.amazonaws.com/voxazedisula/kavasibewusoj.pdf
    • https://uploads.strikinglycdn.com/files/2cebab1d-1222-49f2-b869-0358438f6590/kijasudorupofekoxitivujav.pdf
    • https://s3.amazonaws.com/kavitokolezub/1000_frases_en_ingles_super_utiles_y_comunes.pdf
    • https://s3.amazonaws.com/rozebofukixus/smartboard_math_games_1st_grade.pdf
    • https://uploads.strikinglycdn.com/files/b5f712c2-5677-44c7-a0ed-85f626f78abf/fefot.pdf
    • https://s3.amazonaws.com/sitozi/resident_evil_7_biohazard_para_android.pdf
    • https://s3.amazonaws.com/wuniku/the_sniper_short_story_plot_diagram.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_off0000b797.bin
c9901e0a04b2a4929e70bfbd9307241f888aaa77cc27a722b53f2c40d72f1266
pdf-font-stream PDF embedded font (sfnt) at offset 0xB797 5628 bytes
font_01_sfnt_off0000cab0.bin
ea6e7f6cfe3ce8bf8945d3e8aa21a662d4b376ae1ec39e18e41e92a9be50193e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB0 9680 bytes