Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3836d2a7c00f8c3…

MALICIOUS

PDF

76.9 KB Created: 2021-03-16 13:44:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2a3a2e1a0deeb4804097d839d4bf735 SHA-1: 4478d0c58887d58cc27d6212a3e4140b276a8519 SHA-256: b3836d2a7c00f8c3d927770ed0a034112285957b169d643a06c056da0ae9dc41
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'dafemum.ru', which is likely used to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to 'Bioshock steam achievements guide', aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/123?utm_term=bioshock+steam+achievements+guide
    • https://cdn-cms.f-static.net/uploads/4495241/normal_6011d8fd88dc8.pdf
    • https://cdn-cms.f-static.net/uploads/4387036/normal_6042a62ce06fd.pdf
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/rovarexafe.pdf
    • https://simokenuma.weebly.com/uploads/1/3/5/3/135311421/rozuzuledo.pdf
    • https://cdn.sqhk.co/gidenateg/nbxWid9/rwby_ruby_x_male_wolf_reader.pdf
    • https://cdn-cms.f-static.net/uploads/4376354/normal_6047beb6af47f.pdf
    • http://yblda.fun/cardiopatia_isquemica_2017ynjg8.pdf
    • https://lofuniwap.weebly.com/uploads/1/3/0/8/130874201/movevipixibovazes.pdf
    • https://beperupofifu.weebly.com/uploads/1/3/1/6/131636755/wifobidekizuze_rixilalik_zusinezevil_ribenukuki.pdf
    • https://cdn.sqhk.co/tedigedubemi/hpWxibx/ballinger_architects_glassdoor.pdf
    • http://hamlikjorettoop.ru/86711254378szjr9.pdf
    • https://cdn-cms.f-static.net/uploads/4500440/normal_5fd201305e838.pdf
    • http://new-leggins.site/dodasitutetogev1calw.pdf
    • http://20970907.net/fejofixawepo42ga4.pdf
    • https://cdn.sqhk.co/rijuratin/vO32haR/bleach_vs_naruto_3._2_android.pdf
    • https://static.s123-cdn-static.com/uploads/4465010/normal_6008d1bb04c1c.pdf
    • https://cdn.sqhk.co/romafime/TgcK7ja/master_s_degree_environmental_studies_online.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dofufiri/leading_coefficient_test_worksheet.pdf
    • https://s3.amazonaws.com/fasudikek/how_long_to_see_results_strength_training.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_off0000efbf.bin
7d763796158ffac73b546bec0d8af95ecea4d54a07ec29a6054dc95fac9ebe05
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBF 5396 bytes
font_01_sfnt_off00010203.bin
a5b41973235113267834935b778fce14c7302caa4e87a106db4462d4e883a302
pdf-font-stream PDF embedded font (sfnt) at offset 0x10203 10596 bytes