Malicious PDF — malware analysis report

Static analysis result for SHA-256 869ee1a3569a7544…

MALICIOUS

PDF

76.6 KB Created: 2021-04-01 13:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71e05b9f06d0c9d9db7466aab42b68a3 SHA-1: de519d0af956868bf3768679dbe8209d7968e988 SHA-256: 869ee1a3569a7544f48f4e63346988d6719e8c8cfba5cdf19bd930e61c63134e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF link farm'. The primary external URL observed is 'https://botokaw.ru/strik?utm_term=read+text+file+in+html+page'. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', indicating a phishing or trojanized document. No scripts were extracted, but the presence of numerous links suggests a phishing or SEO spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=read+text+file+in+html+page
    • https://cdn-cms.f-static.net/uploads/4370307/normal_6046af44a78fa.pdf
    • https://gufekibeliwu.weebly.com/uploads/1/3/1/3/131382841/3e953.pdf
    • https://cdn.sqhk.co/bejomewuv/hjfHgdY/81778191303.pdf
    • https://cdn-cms.f-static.net/uploads/4418788/normal_604af573151cf.pdf
    • https://cdn-cms.f-static.net/uploads/4446285/normal_60366a73ee24e.pdf
    • http://veselutut.mywebcommunity.org/how_to_get_donations_from_coca_cola.pdf
    • https://static.s123-cdn-static.com/uploads/4384655/normal_5fecd3b72736c.pdf
    • http://kokulotasuz.mygamesonline.org/acta_constitutiva_de_una_empresa_mexicana_en.pdf
    • https://cdn-cms.f-static.net/uploads/4456132/normal_6046598ce4ad9.pdf
    • http://dalidusiz.mywebcommunity.org/7277882362.pdf
    • https://cdn.sqhk.co/fovomesit/gNxgfjf/loretoluruwemebevibanofut.pdf
    • http://nunejabu.scienceontheweb.net/96316423752.pdf
    • https://cdn.sqhk.co/movumatoz/QibyjMg/75513907928.pdf
    • https://kiradaropamun.weebly.com/uploads/1/3/1/0/131070158/1779131.pdf
    • https://cdn-cms.f-static.net/uploads/4410965/normal_6057c0262d389.pdf
    • https://cdn.sqhk.co/zetikitor/O7tghjf/real_steel_world_robot_boxing_game_play_online.pdf
    • https://cdn.sqhk.co/rizonozugaj/hfhgz5t/nostalgia_nes_emulator_android_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4380523/normal_5fc775b59e300.pdf
    • https://static.s123-cdn-static.com/uploads/4465149/normal_5fca102e579a1.pdf
    • http://gopadaxin.mywebcommunity.org/esclerosis_multiple_que_es.pdf
    • https://cdn-cms.f-static.net/uploads/4388824/normal_6044c7a306c35.pdf
    • https://gasogufimuti.weebly.com/uploads/1/3/4/4/134461051/finalozurumonuk-ronoxaxedivugi-ziraf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://miganuvag.myartsonline.com/pinotim.pdf
    • http://tizexazebubo.atwebpages.com/8716296140.pdf
    • http://wukevivetarapu.myartsonline.com/causes_of_acute_appendicitis.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_off0000ea64.bin
4ecc51a36527f48003985b76ddd766047c21833f274440dd6ba6a2aceb5591b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA64 5256 bytes
font_01_sfnt_off0000fc2e.bin
bb28e7061370f59f54d71891f5ea0a947afc0e49dac22a954eb0e1537d265433
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 11980 bytes