Malicious PDF — malware analysis report

Static analysis result for SHA-256 951e6adb387a11e6…

MALICIOUS

PDF

68.0 KB Created: 2020-11-19 17:54:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fb3c80382db67f6ed39250c3bcf68a5 SHA-1: d0a08263d357470da78432c127f73a2e041c418d SHA-256: 951e6adb387a11e6b633cd4f8208a7c31bb2ac6017de4aad8146bcf6434cb76d
214 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text related to "Aimersoft dvd ripper problems", suggesting a lure. The presence of numerous external PDF links, many with numeric slugs, indicates a potential link farm for SEO poisoning or distributing further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ggtraff.ru/123?utm_term=aimersoft+dvd+ripper+problems
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/1072632.pdf
    • https://wagagigowov.weebly.com/uploads/1/3/4/4/134450731/6321080.pdf
    • https://wikexedijul.weebly.com/uploads/1/3/4/6/134659224/59d9f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vaxebisapesi/gnu_gdb_debugger_command_cheat_sheet.pdf
    • https://uploads.strikinglycdn.com/files/86a20292-6f40-46f6-ba91-a323c785e19b/training_consultants_login_aspx.pdf
    • https://s3.amazonaws.com/leributafa/18376174819.pdf
    • https://uploads.strikinglycdn.com/files/35016d89-f951-4fa4-9186-0887d93967b8/45181193911.pdf
    • https://s3.amazonaws.com/tipikaxe/dynamic_linear_models_with_r.pdf
    • https://s3.amazonaws.com/vonuxagupeduze/blood_and_thunder_hampton_sides.pdf
    • https://s3.amazonaws.com/jevopemosod/god_gold_glory_definition_world_history.pdf
    • https://s3.amazonaws.com/bezegoluzose/ohio_guidestone_akron_oh.pdf
    • https://s3.amazonaws.com/jiguwuzobozobaz/chopin_winter_wind_piano_sheet_music.pdf
    • https://s3.amazonaws.com/firudegix/93503325977.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_off0000cce2.bin
a2f804a2f128db40a6d9cbcef61872f6e96b28dbcc551e0b8f525a553278fca8
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE2 5164 bytes
font_01_sfnt_off0000de5f.bin
192ffa7c85a0b1527fbe800263a53b8f85ff69790c73f21ed07f798d4043f8f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 10960 bytes