Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b000d37310830a4…

MALICIOUS

PDF

78.8 KB Created: 2021-05-28 16:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfea36a2dca1d116d63c0a57779731c5 SHA-1: 99c4c535f5267f8fc1b209dc094c0cefc754162d SHA-256: 4b000d37310830a428cbaec2250eab53cb7122990b833fd5924d2ece256197c9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The 'PDF_SEO_LINK_FARM' heuristic suggests the document contains a large number of external links, likely to manipulate search engine results or direct users to malicious sites. The embedded URL 'https://dugedepap.ru/strik?utm_term=my+cafe+recipes+and+stories+cheat+codes' is a primary indicator of this activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/strik?utm_term=my+cafe+recipes+and+stories+cheat+codes
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/lixebod_futipom_nilurot.pdf
    • https://cdn-cms.f-static.net/uploads/4455370/normal_60465edea75ab.pdf
    • https://static.s123-cdn-static.com/uploads/4375075/normal_5fed496ff17cf.pdf
    • https://gomamatugapisum.weebly.com/uploads/1/3/4/3/134392688/kobirokadar_nejuzo_nimupobo.pdf
    • https://gonadasefu.weebly.com/uploads/1/3/5/3/135345348/e5059fcb032ffcf.pdf
    • https://static.s123-cdn-static.com/uploads/4412774/normal_5ff29076187cb.pdf
    • https://cdn-cms.f-static.net/uploads/4379959/normal_603d9a1e878bc.pdf
    • https://cdn-cms.f-static.net/uploads/4480745/normal_5fe9a1f32d972.pdf
    • https://cdn-cms.f-static.net/uploads/4386366/normal_5fd861196b16f.pdf
    • https://misurabize.weebly.com/uploads/1/3/4/6/134666879/vanot-basezufo-mipenuz-xadujanexufu.pdf
    • https://mavarovepuz.weebly.com/uploads/1/3/4/8/134865609/badcbd11.pdf
    • https://static.s123-cdn-static.com/uploads/4455914/normal_5ff66108a6242.pdf
    • https://static.s123-cdn-static.com/uploads/4486984/normal_6006ccdaa81bd.pdf
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/mawegeweke-janemupoxakewe-dajufu-vadon.pdf
    • https://nimorozidu.weebly.com/uploads/1/3/4/3/134373006/3323238.pdf
    • https://static.s123-cdn-static.com/uploads/4402712/normal_600479f97cb85.pdf
    • https://cdn-cms.f-static.net/uploads/4377663/normal_606374cda2f72.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e9f75aea-e327-4f2a-a796-a52f4c72e975/safety_goggles_over_glasses_home_depot.pdf
    • https://uploads.strikinglycdn.com/files/bae202dd-e2e6-4787-b15a-580cb5884934/sikorim.pdf
    • https://uploads.strikinglycdn.com/files/be9e3d89-146c-4932-8134-24603eff42b9/er_verb_conjugation_in_spanish.pdf
    • https://uploads.strikinglycdn.com/files/70ad093c-3ea7-461e-a7d2-7fd3e6df7f30/ge_24_hour_timer_directions.pdf
    • https://uploads.strikinglycdn.com/files/c6bf6761-02ed-4a5a-91fb-2b420ad67341/infinity_gauntlet_comic_book.pdf
    • https://uploads.strikinglycdn.com/files/be104a23-4ba8-42fe-90a1-99180fce77a7/how_to_check_transmission_fluid_level_on_2014_honda_civic.pdf
    • https://uploads.strikinglycdn.com/files/1697ea0e-9979-4097-8bf9-7d9173de87dd/the_things_they_carried_sparknotes_quiz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f515.bin
ed1f7fb0bfc07c4e6b61c726194a9e86115a72311adf3f49ad4092a73985b823
pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 5316 bytes
font_01_sfnt_off0001073d.bin
8ae75161aeea88314159e0c91dee42f1508b28b5d87ad67290018e14f0f698bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1073D 11280 bytes