Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d53862b8ce7b387…

MALICIOUS

PDF

80.0 KB Created: 2021-03-29 16:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c898cab102d5edfbb0f6b1063805a327 SHA-1: 0e7293fd4efb5201b9dcafdc12aa22555628c151 SHA-256: 1d53862b8ce7b38757c3ec9f8a6c70b118c074e385da5feb67d3c5208e2de2f2
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files hosted on disposable domains, indicating a link farm or SEO manipulation tactic. Several heuristics, including 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM', confirm this behavior. The presence of a CAPTCHA-themed lure and a URL with a 'microsoft project' search term suggests an attempt to trick users into downloading potentially malicious content. While no scripts were extracted, the overall structure and link distribution strongly suggest a malicious intent to redirect users to harmful sites or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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 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.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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://kuzutuzo.ru/strik?utm_term=microsoft+project+2010+for+mac+free+download+full+version PDF link annotation
    • https://nowipulegetubut.weebly.com/uploads/1/3/4/6/134647137/rabamafebi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426953/normal_6029fe2de31aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406806/normal_5fcd0ef8177b6.pdfIn PDF document text
    • https://jujipepovoduvu.weebly.com/uploads/1/3/4/0/134017188/5855346.pdfIn PDF document text
    • https://fesinukovib.weebly.com/uploads/1/3/4/7/134715349/dobaxoxaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409248/normal_5fd228304e758.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447888/normal_5fc9db3d52528.pdfIn PDF document text
    • http://sesopuligu.iblogger.org/xopiguxobobesazow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460466/normal_6010df1c0f93d.pdfIn PDF document text
    • https://sujezebaxoxil.weebly.com/uploads/1/3/4/3/134316131/bedegidutawafes.pdfIn PDF document text
    • https://tipuxefisabe.weebly.com/uploads/1/3/4/8/134846761/4600902.pdfIn PDF document text
    • https://rowopubogapog.weebly.com/uploads/1/3/4/2/134234702/73d590cfbff3996.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pitupeg.epizy.com/buster_captcha_solver_for_android.pdfIn PDF document text
    • http://wuzuvulas.epizy.com/les_carnets_de_cerise_tome_1.pdfIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_07277d9556124842b73724f0987386ea.pdf?index=trueIn PDF document text
    • http://dajivetu.rf.gd/does_xbox_one_wireless_adapter_work_with_xbox_360_controller.pdfIn PDF document text
    • http://divimere.epizy.com/57462229587.pdfIn PDF document text
    • http://rekulino.epizy.com/history_of_english_literature_wikipedia.pdfIn PDF document text
    • http://vejemomase.epizy.com/39396376042.pdfIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_b4eb4499e57842e485ee81098bf2662a.pdf?index=trueIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_f343777c7ffc4151bac7dc3778e499db.pdf?index=trueIn PDF document text
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_b48e7dbd4a6e4e2f9e5f3ab4bf717b2a.pdf?index=trueIn PDF document text
    • http://vamivesuger.epizy.com/69112678644.pdfIn 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_off0000f9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AD 5860 bytes
SHA-256: 4e0c18761d4d946906eb9dc18fa1f137d7fd44eb1cb61ba944e6fc203a02069e
font_01_sfnt_off00010db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB7 10704 bytes
SHA-256: 00f24ae5a5938a42fe723321e0640b0e70ec7e836e698b637cbebd0f41d0119a

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