Malicious PDF — malware analysis report

Static analysis result for SHA-256 e108652d2c8bd14e…

MALICIOUS

PDF

75.1 KB Created: 2021-03-29 03:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b751673c5f1035642e11b20b68cd2928 SHA-1: d44e56fc1448ec70cddcf95144e3ebe4147edb30 SHA-256: e108652d2c8bd14ee80257e8b75ef3d582a3df1f1763d47cd642b1473277d579
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF files, many hosted on disposable domains. This suggests a tactic to manipulate search engine results or to distribute further malicious content. The presence of a 'Download' button heuristic further supports the lure-based nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/award?keyword=bengali+magazine+pdf+file+download PDF link annotation
    • https://zerurejapom.weebly.com/uploads/1/3/5/9/135964845/tetopokimutip-velej.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/HmQMjdB/nutaxagegomidubumunavap.pdfIn PDF document text
    • https://gegirugotosizuk.weebly.com/uploads/1/3/5/3/135397722/9148894.pdfIn PDF document text
    • https://vilekelapufixev.weebly.com/uploads/1/3/4/5/134508089/gafif.pdfIn PDF document text
    • https://lisewaduw.weebly.com/uploads/1/3/4/3/134358893/xavopelozud-domikulosupim-rewevosufazaves-somadowekanuwuf.pdfIn PDF document text
    • https://jesugenug.weebly.com/uploads/1/3/1/4/131406432/9c63e7efeb67.pdfIn PDF document text
    • https://zulazuxalumino.weebly.com/uploads/1/3/1/6/131606396/9491146.pdfIn PDF document text
    • https://zodukaveg.weebly.com/uploads/1/3/5/3/135345947/ef8877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374968/normal_60151ec451198.pdfIn PDF document text
    • https://cdn.sqhk.co/pevejotomoma/bQIrmjd/car_scanner_elm_obd2_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403428/normal_6043b838d77e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wivoruremuwun.rf.gd/53438422771.pdfIn PDF document text
    • http://najiniroxow.rf.gd/25114387030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/064803ba-43e4-43d9-ac9c-6824953d7bfa/menoragola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fc77fe7-1931-46b5-9900-82e85101ce24/lenovo_t420_bios_update_usb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b53e4baf-f584-455b-b8e7-5f11db060fcd/pexexugoxivigixime.pdfIn PDF document text
    • http://nabaxaroxofujo.epizy.com/what_is_florida_covid_19_rules.pdfIn PDF document text
    • http://kovusilo.epizy.com/thomas_calculus_cilt_1_trke.pdfIn PDF document text
    • http://kijekamazeju.epizy.com/adineue_pro_light_free.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_off0000e8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8ED 5276 bytes
SHA-256: 0cf52b15cbcc397338d17637ab029deeb06c558f812f9c891a59191755d7f697
font_01_sfnt_off0000faf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF5 10788 bytes
SHA-256: 2e36cc6df39f02b277713cc2d24eefa545f4ad7cee9bf3c853a9713584d1ac66