Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71f4fe37dc57213…

MALICIOUS

PDF

78.2 KB Created: 2021-04-17 21:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 96a3fc502f2e0a79bb155545d2d9bbde SHA-1: 5d103f7c6f1d82459258d35b80d155fe4fb26d34 SHA-256: a71f4fe37dc572139ba2f2c57fff0145671b110656c2246b15cd21cf7093c6c4
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or link-farming operation. The PDF structure and embedded URIs are consistent with attempts to redirect users to malicious websites, likely for credential theft or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=les+mis+film+songs PDF link annotation
    • http://gigezesuzobe.getenjoyment.net/authentication_and_authorization_controls.pdfIn PDF document text
    • http://copyright-securityx.com/80912543907flvj0.pdfIn PDF document text
    • http://uorott.com/newasajk2gig.pdfIn PDF document text
    • http://detonic-buy.website/amu_online_form_20207xfpl.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/discrete_mathematics_and_its_applications_5th_editionuagvs.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/5049947094.pdfIn PDF document text
    • http://musc-media.xyz/how_to_measure_stress_concentration_factoregeus.pdfIn PDF document text
    • http://shop-kid-toys.online/kupam6pmhr.pdfIn PDF document text
    • http://yoga-fitness.space/word_problems_grade_9_algebra6v5ol.pdfIn PDF document text
    • http://yoganchik.space/dorikenidivuje8jjj9.pdfIn PDF document text
    • http://ziwixan.iblogger.org/minecraft_carpenter_s_blocks_1._12._2.pdfIn PDF document text
    • http://devgm.design/find_the_solution_set_of_linear_equationy9wxg.pdfIn PDF document text
    • http://br1.red/65301201303zt96p.pdfIn PDF document text
    • http://kino-vezde.ru/nom_scientifique_plante_carnivorebbzec.pdfIn PDF document text
    • http://tumbochka.space/lion_city_violin_1_sheet_musicixp03.pdfIn PDF document text
    • http://golomashvanna.xyz/arabic_english_bible_free_downloadpus13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e321b6f2-2a0a-4c58-8c60-26baf46d82f1.filesusr.com/ugd/14900c_344872b43cb5425f98e78f2f5cef40ba.pdf?index=trueIn PDF document text
    • http://tofarogupa.rf.gd/hashar_film_hd.pdfIn PDF document text
    • http://xatulebebulife.rf.gd/tchibo_cafissimo_compact_manual.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_4cb5c5b06cd44003bd2108f241d0cdf5.pdf?index=trueIn PDF document text
    • http://zirafefovijab.epizy.com/pizaluwa.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_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 4720 bytes
SHA-256: 7238ef4f5d3aa52fbb37a45167f78bf6ba935d0152305c1366da61628c05d67f
font_01_sfnt_off00010627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10627 11136 bytes
SHA-256: 5df991bb5c29dcd6ac77b14db35f41ef6c8abc440a907350b2b1e63e15b2ea68

Open this report in the interactive analyzer, or submit your own file for analysis.