Malicious PDF — malware analysis report

Static analysis result for SHA-256 4875a2d954044a6a…

MALICIOUS

PDF

73.8 KB Created: 2021-03-03 18:46:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1d9e19f1dd4bbac36e5e3a2b5b7b649 SHA-1: 7d5a0790e2569a461d71ef3099385c7a9791a338 SHA-256: 4875a2d954044a6a3b89a2059bbd763533d226b782b5fac92ced6bbf41e40572
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic flagging a 'link farm' designed to direct users to a large number of other PDFs. One of the primary external URIs points to 'xezojetit.ru', suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the ML classifier's high confidence score further support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/123?utm_term=dap-1650+wifi+range+extender
    • https://labajilawuja.weebly.com/uploads/1/3/1/4/131406369/xonukumoduvupaguj.pdf
    • https://fagesuxolibedif.weebly.com/uploads/1/3/0/9/130969327/5da6df468f57.pdf
    • http://tijudozi.scienceontheweb.net/how_to_bypass_alarm_zone_adt.pdf
    • http://xisumagogali.getenjoyment.net/chicco_keyfit_30_stroller_reviews.pdf
    • http://potawuzaj.medianewsonline.com/76437791900.pdf
    • http://free-at.pro/choose_the_right_answer_to_these_questionsx1hir.pdf
    • https://rududevuguwufo.weebly.com/uploads/1/3/4/0/134097114/ximesapabozojegubut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gigonusotomofi.rf.gd/antivirus_apk_pro_free.pdf
    • https://s3.amazonaws.com/jarirotexab/94479211060.pdf
    • https://s3.amazonaws.com/xefezesebusu/aramusha_for_honor_guide.pdf
    • https://s3.amazonaws.com/jemisajoda/buzakinezafaluguvenupefo.pdf
    • http://bafuxinasu.epizy.com/adobe_photoshop_elements_11_serial_number.pdf
    • http://pekafujojef.onlinewebshop.net/the_journey_of_man_a_genetic_odyssey_video.pdf
    • https://s3.amazonaws.com/lewuli/70941096077.pdf
    • https://s3.amazonaws.com/fulosobezur/bhojpuri_video_dj_song_2019_mp4.pdf
    • https://s3.amazonaws.com/nilafafakem/7337057826.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_off0000e1f0.bin
83166bf4505a41643fedfac3efe89b39c51950e675df47398aaa11a51911061e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 5660 bytes
font_01_sfnt_off0000f577.bin
67c0aa5e02d40b188200ca40f2c177c4cfbe67df1d2979d3488600866356debf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 10932 bytes