Malicious PDF — malware analysis report

Static analysis result for SHA-256 136fdc69f8789f67…

MALICIOUS

PDF

80.6 KB Created: 2021-02-27 15:18:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dab4d0c04916e6004009e099e87e3331 SHA-1: 9ef07aa594c9ffe1657767988d46a9dc577026dd SHA-256: 136fdc69f8789f6775c09af13737c28964075425a95e4daf96b5578255907edc
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, and is described as a link farm. The document body, though heavily obfuscated, suggests a lure related to a 'harley davidson softail service manual pdf', aiming to trick users into visiting malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/123?utm_term=2004+harley+davidson+softail+service+manual+pdf
    • https://static.s123-cdn-static.com/uploads/4501385/normal_5ffc1d03e795a.pdf
    • https://cdn-cms.f-static.net/uploads/4452382/normal_602ac51be7f6d.pdf
    • https://cdn-cms.f-static.net/uploads/4383704/normal_5fe6187b87911.pdf
    • http://biduwupukipajov.22web.org/24781058671.pdf
    • https://cdn-cms.f-static.net/uploads/4414173/normal_5fe81d5046451.pdf
    • https://static.s123-cdn-static.com/uploads/4402953/normal_5ff9c4715eea6.pdf
    • https://cdn-cms.f-static.net/uploads/4463266/normal_603a0450e181b.pdf
    • http://usesalle.xyz/is_a_smart_car_expensive_to_maintainxiimg.pdf
    • http://wdd13.ru/kiwatuwumetefopu58llv.pdf
    • http://hookup682.site/marotolb2tm.pdf
    • https://cdn-cms.f-static.net/uploads/4444649/normal_6034495aaa548.pdf
    • https://cdn-cms.f-static.net/uploads/4384460/normal_5fe9a1c45d683.pdf
    • https://static.s123-cdn-static.com/uploads/4406501/normal_5ff27aa8cfec9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zisuvedo.rf.gd/avgas_100ll_technical_data_sheet.pdf
    • http://jixosakotipol.epizy.com/5602709370.pdf
    • http://wokixewo.epizy.com/raminifemulizitutejuzirat.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db46.bin
d0cbd741b3a1ab6038ccfdd364acb4b4d955b4618f85e689e8a1f026ec1ecc1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB46 3288 bytes
font_01_sfnt_off0000e70a.bin
6f651e656cb225d6441bc7c0e3fce3b4479aa5fab7c0eaf01f9caea30b95d8c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 5824 bytes
font_02_sfnt_off0000facd.bin
0bd2dc991f28e288d03f637b5d06dbfec649812dac06a4bff6290395abd4b6fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFACD 10784 bytes
font_03_sfnt_off00011f0c.bin
f37c840315c5b02a744758f2d6afb86c799b368d0d56d4d58426dfd1287c49b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0C 16332 bytes

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