Malicious PDF — malware analysis report

Static analysis result for SHA-256 689efccc77bff15b…

MALICIOUS

PDF

85.0 KB Created: 2021-05-16 00:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 03982965bc7195105c1c4cb51a73ab43 SHA-1: 2179c9377e33d3c7770e7220e5e27a5d4af56cdf SHA-256: 689efccc77bff15b20d22fbce9919a1b9f79be9df549c21ad4c65099bee7d5b5
186 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 hosted on disposable domains, suggesting it functions as a link farm. The primary URL, 'https://xezojetit.ru/strik?utm_term=psalm+23+1-5+niv', appears to be a lure, possibly for phishing or to distribute further malware. No scripts were extracted, but the PDF structure and numerous external links point to a malicious distribution or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=psalm+23+1-5+niv PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365589/normal_60470560ca6db.pdfIn PDF document text
    • https://gileledera.weebly.com/uploads/1/3/0/8/130874536/3bb9252fd73d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370059/normal_60149214d6109.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_6031f824bb2b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379982/normal_6069d695b60c8.pdfIn PDF document text
    • https://venonaneguwar.weebly.com/uploads/1/3/5/3/135398509/4188011.pdfIn PDF document text
    • https://zokejiwiperasuk.weebly.com/uploads/1/3/4/6/134668939/rewepi_remoparoxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_6023fafd23c5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_6036599206c32.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://uploads.strikinglycdn.com/files/8d331e0f-7a98-42ce-bbce-674ca53039e5/xinatavafapefokiwol.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_f5e133a7fc3448df86bad18472b300a0.pdf?index=trueIn PDF document text
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_1a25daad71c0433cacccb5feb8c0367c.pdf?index=trueIn PDF document text
    • https://17c3d818-7f64-4152-976a-2fa997d7a7be.filesusr.com/ugd/e2c250_b9242ddcf94e44f5b3ca28986b72adaf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutisigila/apple_ipod_shuffle_5th_generation.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/filmywap_telugu_movie_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/how_do_i_limit_character_count_in_word.pdfIn PDF document text
    • https://50e0a74f-e7a5-4ac3-a7a6-4cdd7b1ad00e.filesusr.com/ugd/8a9d9f_1e745fa11baf43e49aea86c5597eca7a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4301bcf8-9da9-4d5b-8e63-401becb31922/timex_expedition_indiglo_wr100m_band.pdfIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_e7100bd7377e4780994832862c177e0e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/the-edge/podcasts/pod_15_12_06.mp3PodcaIn 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_off00010364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10364 4780 bytes
SHA-256: 755e537add8b1cd981aaac3029fb4fa6bdabbb9542c8ddf7589443616ae1e463
font_01_sfnt_off0001137d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137D 10964 bytes
SHA-256: 6c7d87dca7add5ba92c36637054448b6026078b29200921c29fa013f7363013c
font_02_sfnt_off00013908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13908 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361