Malicious PDF — malware analysis report

Static analysis result for SHA-256 27908057382fc61e…

MALICIOUS

PDF

75.9 KB Created: 2021-01-13 06:45:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe314de4fa6d27f336ae7304c238ad4d SHA-1: 7a5dcba750ccf090122e6d00a5c3df304fa852d6 SHA-256: 27908057382fc61e7ba7c66f532f5adf36fd9db4665edc618766530861505853
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://trafffe.ru/123?utm_term=4+pi+r%255E2h
    • https://site-1177829.mozfiles.com/files/1177829/star_wars_jedi_fallen_order_2_news.pdf
    • https://site-1195328.mozfiles.com/files/1195328/16022135688.pdf
    • https://wotudopis.weebly.com/uploads/1/3/4/6/134679731/6cb970b.pdf
    • https://site-1180705.mozfiles.com/files/1180705/16865127209.pdf
    • https://mujolimu.weebly.com/uploads/1/3/4/8/134868529/gafiwomofesebuda.pdf
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/niburavopokas-sezuvukuf.pdf
    • https://static.s123-cdn-static.com/uploads/4385230/normal_5feef3faaeff6.pdf
    • https://nopeludaseji.weebly.com/uploads/1/3/3/9/133986928/815e2d4c.pdf
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/zoraxegis.pdf
    • https://bijifejutumaxob.weebly.com/uploads/1/3/1/3/131381781/kazono.pdf
    • https://site-1174609.mozfiles.com/files/1174609/wyze_cam_pan_setup_troubleshooting.pdf
    • https://cdn-cms.f-static.net/uploads/4500201/normal_5fb2d3d280deb.pdf
    • https://static.s123-cdn-static.com/uploads/4406202/normal_5fedc16915d6a.pdf
    • https://site-1177005.mozfiles.com/files/1177005/science_textbook_class_9_ncert.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pafiganovavi/cms-_1500_claim_form_worksheet.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_off0000c9f7.bin
40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F7 2900 bytes
font_01_sfnt_off0000d43b.bin
cbb625ecdebad91fbc89ffbea9234ea095a911741f892f49b3f583c83b0d892b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD43B 4660 bytes
font_02_sfnt_off0000e41d.bin
ef73af480afe5a6b7d707edf211a8e60492931d6600598e9df9567ccd908eecc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 12468 bytes
font_03_sfnt_off00010d95.bin
35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D95 16036 bytes

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