Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45a57cc08d4e66e…

MALICIOUS

PDF

83.8 KB Created: 2021-04-06 10:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0c464db742b7fb4961d46cd8f7c51ea9 SHA-1: 76cdf95dcb4c9d8439561481e035677ad313fb7b SHA-256: e45a57cc08d4e66e00c2f5776da04bd3c412ffd874d160e0887725e434ad6db3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. This is supported by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, indicating a potential attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/award?keyword=bulletproof+diet+pdf+free PDF link annotation
    • https://wifusudufasebo.weebly.com/uploads/1/3/5/9/135992472/zibegawo_netubane_zopogovopined_sosez.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/wfuhcgh/24411626797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368952/normal_604e7ee48a8e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416153/normal_6014192a4c9c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417329/normal_604fdf7dea879.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/hiHjchc/life_and_death_quotes_in_urdu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446289/normal_602698310864c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444377/normal_6034fe91ba008.pdfIn PDF document text
    • https://komutezux.weebly.com/uploads/1/3/1/3/131398036/motixalapinat_tesizedi.pdfIn PDF document text
    • http://pavawafupef.66ghz.com/9894250302.pdfIn PDF document text
    • https://tisuzozolida.weebly.com/uploads/1/3/6/0/136087901/gemeno.pdfIn PDF document text
    • https://riviruzo.weebly.com/uploads/1/3/0/7/130739493/4141046.pdfIn PDF document text
    • https://kofukupapakube.weebly.com/uploads/1/3/4/5/134586312/6c6a706ab460ff5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/risalenefazozo/what_it_means_to_dream_about_a_baby_girl.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/python_2._6_string_format_example.pdfIn PDF document text
    • http://vakewexapenox.epizy.com/4097103977.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/can_you_audible_books_to_ipad.pdfIn PDF document text
    • http://zizolim.rf.gd/is_there_a_new_seal_team_episode_tonight.pdfIn PDF document text
    • http://mejuton.epizy.com/602665685.pdfIn PDF document text
    • http://detapiraxexe.epizy.com/5515193580.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/tatimuv.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/how_to_integrate_using_quotient_rule.pdfIn PDF document text
    • http://zapofekeba.rf.gd/genie_pro_screw_drive_learn_button_not_working.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE45 4472 bytes
SHA-256: 4624e3220235d712c657a45e69442e155238e19acd7ef786013f4cbbc6242dcb
font_01_sfnt_off00010d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D94 11312 bytes
SHA-256: a2b5a1835314be62d9367fc0348301fbdccbb9eb4177b49e5ec1231a42365e0b
font_02_sfnt_off000133fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FC 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361