Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ecb36344b333556…

MALICIOUS

PDF

98.0 KB Created: 2021-03-31 08:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 04f6755754fb4fce4a8077548cc11647 SHA-1: c90b014c6b88bd141c4a1d32a130e8181beab58c SHA-256: 3ecb36344b333556154e5fcbd8ead86769f818433148149bc54119c78fc2c94f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm for SEO manipulation or phishing. The primary malicious URL identified is gimoguvi.ru, which is presented as a search result for a game codex. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://gimoguvi.ru/award?keyword=warhammer+40k+eldar+codex+8th+edition+pdf PDF link annotation
    • https://xosulokut.weebly.com/uploads/1/3/4/4/134466674/wokusonekolama_metukuget.pdfIn PDF document text
    • https://tibilizam.weebly.com/uploads/1/3/0/7/130775373/tatizupodipa-melimefoga-xotaxarofeni-lozik.pdfIn PDF document text
    • https://naruvemekojesez.weebly.com/uploads/1/3/4/6/134685524/82f00ee38f22.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/bjfiige/nubigopedelatubav.pdfIn PDF document text
    • http://uabiomanix.xyz/verabupo8fouf.pdfIn PDF document text
    • http://kawlites.online/jason_schaller_wikipediatzz1m.pdfIn PDF document text
    • http://xotujezal.mypressonline.com/acidosis_respiratoria_bioquimica.pdfIn PDF document text
    • http://fastcreditreport.info/what_role_does_the_kidney_play_in_the_excretory_system1j8w2.pdfIn PDF document text
    • http://lnstagramverifycentre.com/kojugakixobhhqu.pdfIn PDF document text
    • https://cdn.sqhk.co/nofatazor/jichhh7/ditobuvo.pdfIn PDF document text
    • https://xabomipa.weebly.com/uploads/1/3/4/4/134484571/59e55c296f9c1e.pdfIn PDF document text
    • https://mejefarekobuk.weebly.com/uploads/1/3/4/3/134338461/ba5575ebc4b.pdfIn PDF document text
    • http://salonly.xyz/22128059805bszp2.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/ihjhhNj/water_ball_jump_games.pdfIn PDF document text
    • https://cdn.sqhk.co/fejovuwov/ihkChic/captions_for_instagram_pics.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/39629276334.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_c44d6727ed254850b6043657fccb83ff.pdf?index=trueIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_67d27d4bec6f415ea96a8d47293c452d.pdf?index=trueIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_d9ee0346600942d487edab98488bd4e4.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_06207280d348477597abb28c7cfdce1e.pdf?index=trueIn PDF document text
    • http://jalijoruki.atwebpages.com/vision_ecology_and_environment.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_off00013d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D37 5788 bytes
SHA-256: 2b390f219e4c08717d8f01ae3ac9089ae129975ee5e881f2138131d52797c803
font_01_sfnt_off000150d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D5 11720 bytes
SHA-256: 044eaf41b62f0e58c93647cedb08a471eec7fcc7e8f35fdc69c7bd74b36def07