Malicious PDF — malware analysis report

Static analysis result for SHA-256 9336b8cd0e8d136a…

MALICIOUS

PDF

75.8 KB Created: 2021-05-31 16:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e49e0dbffbf55a0828b187c0c034748f SHA-1: 830b06567cb304ebb9a84ca604e5ad41dca6261d SHA-256: 9336b8cd0e8d136a18d61b06c39c8fc942b740f445d9d5abdb5067e7e53d23d3
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript T1553.005 Security Software Installation

This PDF document exhibits multiple indicators of malicious activity, including a critical ClamAV detection and ML classification flagging it as malicious. The 'SE_CLICKFIX' and 'SE_SECURITY_BYPASS' heuristics indicate the document attempts social engineering to trick the user into disabling security measures and executing commands. The embedded URL 'https://smidgel.ru/pbw?utm_term=logitech+mk710+arrow+keys+not+working' is likely part of this lure, potentially leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://smidgel.ru/pbw?utm_term=logitech+mk710+arrow+keys+not+working
    • https://cdn-cms.f-static.net/uploads/4427095/normal_6069749d8ccef.pdf
    • https://cdn-cms.f-static.net/uploads/4408352/normal_6063a1537703e.pdf
    • https://zabebopid.weebly.com/uploads/1/3/4/5/134585494/38ee228573f17.pdf
    • https://buvurowu.weebly.com/uploads/1/3/4/6/134638295/8412368.pdf
    • https://cdn-cms.f-static.net/uploads/4369509/normal_6033b094339c5.pdf
    • https://cdn-cms.f-static.net/uploads/4424027/normal_600a6b6e17f89.pdf
    • https://static.s123-cdn-static.com/uploads/4385422/normal_5fcb797995d65.pdf
    • https://tugixafebav.weebly.com/uploads/1/3/2/6/132681891/8913414.pdf
    • https://cdn-cms.f-static.net/uploads/4449417/normal_605434bd26cea.pdf
    • https://zutekavewer.weebly.com/uploads/1/3/4/5/134514418/3559d51c279b8.pdf
    • https://xiwajobuxeke.weebly.com/uploads/1/3/4/6/134637113/falukumel-kojejerozem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c262ea2a-f790-4c6f-80d7-6e8255ea722f/saxerudosojizoxevelumirox.pdf
    • http://kiletejude.pbworks.com/f/libros_de_harry_potter_originales_en_espaolo.pdf
    • https://uploads.strikinglycdn.com/files/5a8bfd7b-b763-41e4-8e27-05527b0e19d9/35014609048.pdf
    • https://uploads.strikinglycdn.com/files/4e10ac4c-5e8d-4457-b0af-3f512ee60f07/livimimek.pdf
    • https://uploads.strikinglycdn.com/files/806c647a-67b1-477e-bc4c-f8ceba6a8465/12594466029.pdf
    • http://supatibu.pbworks.com/f/short_stories_based_on_thirukkural_in_tamil.pdf
    • https://uploads.strikinglycdn.com/files/96baca33-8aff-46f8-a580-20eb3cb2f9e7/minecraft_free_download_mac_1.15.2.pdf
    • https://uploads.strikinglycdn.com/files/ce660fb7-1cc2-443b-bc4c-81d7d0663d9c/briggs_and_stratton_450_series_148cc_blades.pdf
    • https://uploads.strikinglycdn.com/files/9755083a-6f0c-4cdf-979f-46fd06042a0b/to_be_a_slave_julius_lester.pdf
    • http://fuvesiwowegu.pbworks.com/w/file/fetch/144413526/fokolodinurakasitezo.pdf
    • https://uploads.strikinglycdn.com/files/39aa93d2-6b3c-45bd-8127-7290be986bfd/rt-ac68u_manual_reboot.pdf
    • https://uploads.strikinglycdn.com/files/b25360b1-0003-43f6-813d-c28770123f17/murolikimovij.pdf
    • https://uploads.strikinglycdn.com/files/eb5eaf93-67ba-4128-ba51-579d1003bb2f/56544216027.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_off0000e9ed.bin
6442e194f27984ef2f401d09642476ad2d3529fcffb4318e52642c4091edd470
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9ED 5652 bytes
font_01_sfnt_off0000fd2b.bin
5d169f78c60fb81c1532d411a5fd7e454942ed2582f66d6bc22874eff5cfa0fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2B 10760 bytes