Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f5b6619cb9bbef…

MALICIOUS

PDF

110.6 KB Created: 2021-03-07 10:31:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 33f454fbd81aaf3aa9ac58249c24867b SHA-1: d3525a65bb7621e04cd4348bded2dd6aa0333628 SHA-256: a2f5b6619cb9bbef5a2314394fd3802d8fd2d588ac235d464dfdebf4cf8e32e3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for further exploitation.

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://mezovuduw.ru/strik?utm_term=common+arabic+vocabulary+pdf PDF link annotation
    • http://kivudutamazawan.22web.org/23406604973.pdfIn PDF document text
    • https://beluloxepivizor.weebly.com/uploads/1/3/4/1/134131295/a1220926440886.pdfIn PDF document text
    • http://cloudplay.xyz/golf_buddy_vs4_price2fgu2.pdfIn PDF document text
    • https://tunawirivam.weebly.com/uploads/1/3/1/4/131437064/467d715d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413474/normal_60257bded9397.pdfIn PDF document text
    • http://cheeronthemove.store/autocad_architecture_2018_manualwhs5n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370263/normal_60102abf49fb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446400/normal_5fdba08f5a1a4.pdfIn PDF document text
    • https://jibigevemur.weebly.com/uploads/1/3/0/8/130873945/zivejiledejawi.pdfIn PDF document text
    • https://mefewenitili.weebly.com/uploads/1/3/1/3/131379946/kanimesog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421783/normal_5ff4bf80bded1.pdfIn PDF document text
    • https://nozifudofo.weebly.com/uploads/1/3/2/6/132681081/nijepuze.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/home_zone_motion_activated_led_security_light_-_2500_lumens_manual.pdfIn PDF document text
    • http://pe50off.pro/nokoviveputumorurinijuja5eiwd.pdfIn PDF document text
    • http://fuviguz.22web.org/97958071392.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tulajadulixo.myartsonline.com/tojewax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93538caa-5a17-41e6-bc47-ded0bce7d6d9/88259082432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff280696-95dc-4d31-9444-ebc1d374fccb/how_many_carbs_does_a_chai_latte_have.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/043aceec-5acc-42eb-b57a-f90ce472ace0/95795861290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6291a07-7908-4302-b858-26d90b3670bd/chicco_buggy_liteway_3_jet_black_review.pdfIn PDF document text
    • http://womunek.rf.gd/208804100.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000177c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x177C1 30316 bytes
SHA-256: f20eb389946fa27626684c2ee1cada447da958b281b4b68fc95af98d1e2da322
font_00_sfnt_off00014163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14163 5332 bytes
SHA-256: 4165cb59312c5a81291b51324b23125ddc3f6e56195c3dfe1f85e76c557b1d16
font_01_sfnt_off00015378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15378 10904 bytes
SHA-256: 13f9dc4768b94c6a36191de014cfd28459cd7dc4fb6125c11d5e6c4e340d7d9e