Malicious PDF — malware analysis report

Static analysis result for SHA-256 728b790e4d311c9b…

MALICIOUS

PDF

77.5 KB Created: 2021-04-06 13:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 85d91e8936a5d5124b16114db528b1ac SHA-1: db35f334f0edd01b08ee2649993e206dd67c40f1 SHA-256: 728b790e4d311c9b0ad0d7c34ac44d3f90813cd7077355a993e1c37ec86d1494
196 Risk Score

Malware Insights

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

This 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, many of which appear to be part of an SEO link farm designed to redirect users to potentially malicious content. The primary redirector URL is https://botokaw.ru/strik?utm_term=e6+error+code+on+treadmill, which is likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://botokaw.ru/strik?utm_term=e6+error+code+on+treadmill PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451039/normal_6014233c45d1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490736/normal_603b27d8cbe01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373301/normal_5ff2a811965d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428341/normal_60533ee092aac.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/3jjjbxP/sputnik_movie_alien.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/gIVLidF/ghost_town_adventures_mystery_riddles_game_walkthrough.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405642/normal_5fce91d8be817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493597/normal_604cc63eb60af.pdfIn PDF document text
    • https://runizupila.weebly.com/uploads/1/3/4/3/134320381/rokurowirofove_tamiwipabemifa_vimukax_zivakitimasame.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407749/normal_5ff516df4b76d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451561/normal_60202e4656b09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378153/normal_5feb365404fc3.pdfIn PDF document text
    • https://motuzasejufabo.weebly.com/uploads/1/3/4/4/134498516/74a85c.pdfIn PDF document text
    • https://cdn.sqhk.co/rorexamuviz/ahdghz5/everton_team_news_liverpool_echo.pdfIn PDF document text
    • https://cdn.sqhk.co/naruxibe/iZOGehf/dajifofodil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420470/normal_5fe4e4cda47b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375071/normal_5fe25645bdea9.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/orARicw/dadadozokelaxebilewe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_6052e49283e41.pdfIn PDF document text
    • https://xovisifolato.weebly.com/uploads/1/3/0/8/130814526/kuwazatitu-dunurupina-rawuralukuxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF432 5016 bytes
SHA-256: a72f728bd6dd7587e8e8cd1107d21fcc8c7d49795ee9805cb0a9371098212447
font_01_sfnt_off0001052e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 10488 bytes
SHA-256: 02ac597d1a09951c998a84b854e71492751b504fe2c98571771aec2ca3571d30