Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba62ec048fd24d9…

MALICIOUS

PDF

80.4 KB Created: 2021-03-27 16:21:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1744e48711a6d11fb1e411fbc543cdcb SHA-1: a620aae4100b570351ceadf72652d77e62b80605 SHA-256: 5ba62ec048fd24d9e120a5a3c210433da08efb0baf184e14e5d9831d7541cd69
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm or designed to redirect users to potentially malicious sites. The presence of multiple PDF_SEO_LINK_FARM heuristics further supports this, indicating the document's primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://leonvi.ru/award?keyword=ohio+drivers+license+book+pdf PDF link annotation
    • https://vijizonumek.weebly.com/uploads/1/3/6/0/136034009/dubidi.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/lIhhr2p/traffic_sign_turn_left.pdfIn PDF document text
    • https://wamonudikiso.weebly.com/uploads/1/3/0/7/130776885/kunusopima.pdfIn PDF document text
    • https://regifevadep.weebly.com/uploads/1/3/4/4/134476302/fizamijelev_regixil.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/2zFjfib/packers_game_time.pdfIn PDF document text
    • https://cdn.sqhk.co/tatiderubota/jjihgdO/jevag.pdfIn PDF document text
    • http://sekewutu.iblogger.org/weturosaxexenurur.pdfIn PDF document text
    • https://pofitefe.weebly.com/uploads/1/3/4/6/134617546/071a82.pdfIn PDF document text
    • https://cdn.sqhk.co/bokapapukopa/ibhjbfA/minecraft_mob_armor_mod_1._12._2_download.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/jgif70O/fish_tube_video_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/zovigobut/17X5HEk/hattricks_tampa_happy_hour.pdfIn PDF document text
    • https://cdn.sqhk.co/lamajemomu/PXPjggi/lost_b_form_nadra.pdfIn PDF document text
    • http://pumeputokamodo.22web.org/dictionary_of_forensic_science.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/hBhdgjb/51528575782.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/AghVfhg/jowawudi.pdfIn PDF document text
    • https://zitidifomeki.weebly.com/uploads/1/3/1/4/131412181/sexubemusarokute.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_8427800abcf64d9883062d88d6140889.pdf?index=trueIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_654d25c00bb0489c8e21d6924ba44e34.pdf?index=trueIn PDF document text
    • http://jojomuge.epizy.com/16886578301.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_a9258b2206904285932ad6a02aae7316.pdf?index=trueIn PDF document text
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_a7e2e1f116b44457837a837522290850.pdf?index=trueIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_a3947b691cbc4b99b83ccdf598aebad1.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA57 5324 bytes
SHA-256: 9de1e375e7dad836612fa8f3095b4bfa040b58845a1dd25ee882da7346661697
font_01_sfnt_off00010c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6F 11240 bytes
SHA-256: 53060b0debbccd791e0fef81cea336cd444336afb4253f5850a5baf177e87d08