Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef565a8d8ff9f22…

MALICIOUS

PDF

75.1 KB Created: 2021-04-11 15:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1117537294536c57a83651570b221a8d SHA-1: 554fba17610fdf8ebf1b981198f4e64a6701142b SHA-256: cef565a8d8ff9f220cc1026b940fd81648cfaf57822a0bc884e63e5ca228d8e0
226 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://leonvi.ru/strik?utm_term=oz+season+1+free+stream PDF link annotation
    • https://cdn.sqhk.co/jimatoju/jeyDQxE/openttd_newgrf_tutorial.pdfIn PDF document text
    • https://rozazokosu.weebly.com/uploads/1/3/0/8/130813972/pofiwebenixujot.pdfIn PDF document text
    • https://koxiguxizabi.weebly.com/uploads/1/3/1/1/131163763/wosivitewi_nevitikogip_talaji_sefakusal.pdfIn PDF document text
    • https://cdn.sqhk.co/tumotiwo/3oqgjWQ/barbie_dreamhouse_adventures_mod_apk_new_version.pdfIn PDF document text
    • https://bazugibeb.weebly.com/uploads/1/3/1/4/131453150/6396e026bf105.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/K7nhigs/lumusilerot.pdfIn PDF document text
    • http://borutafag.66ghz.com/arvn_of_uniform.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/jnjjifJ/79410710573.pdfIn PDF document text
    • http://tunirugorejef.iblogger.org/81104200823.pdfIn PDF document text
    • https://kadukutinebi.weebly.com/uploads/1/3/4/7/134747046/soboniloz_ziwoxagukaror_vinejugowebaw_gisiteziwito.pdfIn PDF document text
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/sokikubazuf-kexuxa-naxotas-xedujeloser.pdfIn PDF document text
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/pavokebefimu.pdfIn PDF document text
    • https://cdn.sqhk.co/dabekojov/chbACmD/72902163506.pdfIn PDF document text
    • https://pubabugolutaj.weebly.com/uploads/1/3/2/6/132680974/xojolejup-nilojafo-wafufesutatipe.pdfIn PDF document text
    • https://giwirakixa.weebly.com/uploads/1/3/3/9/133999144/kusukozeletisor.pdfIn PDF document text
    • https://sewusadata.weebly.com/uploads/1/3/5/4/135401056/bd72c4cd5aca.pdfIn PDF document text
    • https://mipijanifubu.weebly.com/uploads/1/3/0/7/130739658/ca698fcc2a9c98.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/829589df-999d-4c80-8c36-66b6f146466e/74781492174.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/11797086116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc46adc9-f2c4-4160-85c5-35cf18cba9e8/is_friends_appropriate_for_12_year_olds.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/modinogatipelizel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e87ab573-5afd-4516-8417-a945abdcaa90/nunifatuparozuxumenix.pdfIn PDF document text
    • http://vudogomudem.rf.gd/lakemokapejenus.pdfIn PDF document text
    • http://tobesonev.rf.gd/possessive_adjectives_exercises_esl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3e7c325-9adb-4d80-b780-aaff40a216ad/ford_1715_tractor_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e4f8dbf-933f-45b0-8abe-c9de2fe8f9c1/month_to_month_rental_agreement_british_columbia.pdfIn PDF document text
    • http://wigunegulawiko.rf.gd/how_to_cook_lamb_rack_slow_cooker.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
    • https://uploads.strikinglycdn.com/files/In macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 4752 bytes
SHA-256: 90dd66a5d6b95617ddd78c3bdd07211357dbf6f85cc4b27f1d21d6090dc7f0a4
font_01_sfnt_off0000ebc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 10576 bytes
SHA-256: 1023360681b773db77b07f6ece80ccedfd508d6f080309e4e490db118ff3deae
font_02_sfnt_off00011002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11002 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34