Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a733ff555d4984…

MALICIOUS

PDF

83.2 KB Created: 2021-02-16 07:56:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fdb8a3fab9b0987e1309a9cc7d8e4787 SHA-1: 72b8843770d5a4a759be6dff8472a012526fbe0d SHA-256: a1a733ff555d4984ef74cca86b7579c2ffa20d261e4786a4a95652ecb7813ba5
126 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 phishing or trojan payload. The document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing lure. The presence of external URIs and the overall structure strongly suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/strik?utm_term=which+app+is+best+for+reading+novels+for+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413454/normal_5ff2d60f6b136.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413719/normal_5fcda7f6efd67.pdfIn PDF document text
    • http://terem.space/20468552399g7n2b.pdfIn PDF document text
    • http://tekchambre.xyz/94435198337s9sjb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386609/normal_5fd95c16aad10.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/vuzivusafupelidutuvi4xbwe.pdfIn PDF document text
    • https://cdn.sqhk.co/pejemomet/ij4vjbN/97138414559.pdfIn PDF document text
    • https://cdn.sqhk.co/zakolemafemo/cvu6iaU/reincarcare_cartela_telekom_din_strainatate.pdfIn PDF document text
    • http://jofijuke.22web.org/apache_spark_2._2.pdfIn PDF document text
    • http://social-whisper.ru/tamil_album_video_songs_2018_audiou809z.pdfIn PDF document text
    • http://whitecheat.xyz/6665972341059vsd.pdfIn PDF document text
    • http://logvoz.ru/sony_wireless_bluetooth_headset_manual6pf4x.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/V08ibhj/general_mcinerney_dave_janda.pdfIn PDF document text
    • http://acgmgroup.ru/raxazigotakirunaruddnqk7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426408/normal_5fcdb346e9c99.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://soxalisaxofaba.epizy.com/assyrian_empire_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/rectangular_waveguide_te_modes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 5420 bytes
SHA-256: 4f2552687f21aca9908f6687f583f9717437dfa6a98443e1a9d7699b57c703f0
font_01_sfnt_off000109f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F2 11440 bytes
SHA-256: 341bb9e48cf14935813b267f25139726b549b63cd3b9f910ba9d160d4339970e
font_02_sfnt_off000130cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CC 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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