Malicious PDF — malware analysis report

Static analysis result for SHA-256 05982cce249d914d…

MALICIOUS

PDF

64.9 KB Created: 2021-01-10 02:42:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac8dfde54a9728bb6a3413bb9fd7c743 SHA-1: 9f849695032af50ccb4d18d1434b405762ada0b8 SHA-256: 05982cce249d914d90e3610397c8f75ea2eff620814a2299773f5c467d139952
154 Risk Score

Malware Insights

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

The sample is a PDF document that contains a link to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Ielts writing blank answer sheet'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/aws?utm_term=ielts+writing+blank+answer+sheet
    • https://site-1177442.mozfiles.com/files/1177442/24227261802.pdf
    • https://narogigadi.weebly.com/uploads/1/3/0/8/130874066/c2099e721b.pdf
    • https://site-1173371.mozfiles.com/files/1173371/33999751740.pdf
    • https://site-1179801.mozfiles.com/files/1179801/disapekajugijigokemu.pdf
    • https://site-1174826.mozfiles.com/files/1174826/nesaxesametetuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/petikamov/assembler_des_en_ligne_gratuit.pdf
    • https://s3.amazonaws.com/jeromopelurab/56309973279.pdf
    • https://s3.amazonaws.com/fasanag/woka_woka_marble_shooter_free.pdf
    • https://s3.amazonaws.com/sevoga/fusionner_des_foxit_reader.pdf
    • https://s3.amazonaws.com/fogibi/baaton_ko_teri_video_song_pagalworld.pdf
    • https://s3.amazonaws.com/xumakomowi/barron_s_sat_vocabulary_list.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_off0000c426.bin
08076def259c545d17913225f562c897d964d43c32c7ffb4f111d23a5375c506		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC426 5180 bytes
font_01_sfnt_off0000d5d2.bin
d8087c997ae213c321ae2ae9ac85a84c4f56aa6e1045ac272cd258a4cdbf867a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D2 9608 bytes

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