Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd53b94eab5e024c…

MALICIOUS

PDF

70.9 KB Created: 2021-04-10 00:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2dfb429d7ef9ce7eb7f3ebfd073475eb SHA-1: 926eb140b7775cad971245a8b2086ede712fabd5 SHA-256: bd53b94eab5e024c1fb5d4fefcebe0d50a27d91a37bc13d86b0b8fc70aa53f43
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristics point towards techniques used to obscure malicious links and potentially exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/strik?utm_term=acurite+00611a3+wireless+indoor%252Foutdoor+thermometer+and+humidity+sensor PDF link annotation
    • https://kubinivoboduwu.weebly.com/uploads/1/3/4/6/134601548/8162895.pdfIn PDF document text
    • https://kitupiver.weebly.com/uploads/1/3/4/4/134446404/4652017.pdfIn PDF document text
    • https://mufixedak.weebly.com/uploads/1/3/4/6/134602267/sowunerimuli.pdfIn PDF document text
    • https://zumaboletafu.weebly.com/uploads/1/3/1/4/131454272/2330868.pdfIn PDF document text
    • https://verakolor.weebly.com/uploads/1/3/1/3/131379730/2ebd79d.pdfIn PDF document text
    • https://gajegebukorivip.weebly.com/uploads/1/3/4/4/134487765/vuvoxivekebag-lesagibikew-tafijef-pedat.pdfIn PDF document text
    • https://gisidamuxifa.weebly.com/uploads/1/3/0/7/130775495/zubamamuban.pdfIn PDF document text
    • https://nolujamikudaze.weebly.com/uploads/1/3/4/8/134868466/vanisedarulobosa.pdfIn PDF document text
    • https://likosevatifipol.weebly.com/uploads/1/3/4/5/134584064/febesozolusufokisola.pdfIn PDF document text
    • https://denijebif.weebly.com/uploads/1/3/4/5/134584122/4703552.pdfIn PDF document text
    • https://tixowofo.weebly.com/uploads/1/3/4/5/134592641/7818903.pdfIn PDF document text
    • https://zavitakeji.weebly.com/uploads/1/3/4/9/134904790/2a06c8456125680.pdfIn PDF document text
    • http://topenir.iblogger.org/noxiruga.pdfIn PDF document text
    • http://mugowewu.22web.org/zofigalixel.pdfIn PDF document text
    • https://misekijenag.weebly.com/uploads/1/3/1/3/131380320/xovapimo.pdfIn PDF document text
    • http://jiludedo.iblogger.org/47401891241.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biledimetiwen.epizy.com/how_languages_are_learned_4th_edition_citation.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/jazazas.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/zagiwemadurejagajip.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/78264701167.pdfIn PDF document text
    • http://zusujijotajirun.epizy.com/find_local_travel_guide.pdfIn PDF document text
    • http://lojagajojib.rf.gd/java_jdk_7_for_ubuntu_14._04.pdfIn PDF document text
    • http://belivadu.rf.gd/radio_button_round_border_android.pdfIn PDF document text
    • http://jowakumini.epizy.com/california_vehicle_registration_form.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F7 5908 bytes
SHA-256: a967e3daafa411ab1ff1c08bb41e18eb629b73db52b3a6900cbb12cf21cba4db
font_01_sfnt_off0000e907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE907 10536 bytes
SHA-256: 212d0b3c279a7e6a60629e9c664fc75410dc037ee0385e5a90f71d6516d2db8b