Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bc816738b3f66a…

MALICIOUS

PDF

80.9 KB Created: 2021-03-20 07:29:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 63adcfee68b0d48f1db28ba492c17834 SHA-1: f615d49160ac8938d1c6f33506f4d10dfbdba7a4 SHA-256: a7bc816738b3f66a79d140a64df80e2ff3cbbeef952b4ec68c95b2112f6b40bf
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/wix?keyword=sims+4+how+to+get+playful+emotion PDF link annotation
    • https://cdn.sqhk.co/lajawawinu/aZYighb/dokilesosufivok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473052/normal_605159aac7ab0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444378/normal_604b4390d4fd2.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/ahijTgj/science_journal_articles_are_usually.pdfIn PDF document text
    • https://winilogixibofop.weebly.com/uploads/1/3/1/4/131408061/letofonefamigas.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/hhgicgf/41908693840.pdfIn PDF document text
    • https://cdn.sqhk.co/lowixadoges/hfUgejj/hasbro_beyblade_burst_epic_rivals_battle_set.pdfIn PDF document text
    • https://cdn.sqhk.co/terupilenu/F11bhj0/cross_stitch_fabric_walmart_canada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5fd963491fb1f.pdfIn PDF document text
    • https://cdn.sqhk.co/panufarubel/dFhh7aR/rival_knights_ios_11_download.pdfIn PDF document text
    • https://jaxenexeleti.weebly.com/uploads/1/3/5/3/135320290/eb7e3cb9.pdfIn PDF document text
    • https://medofigovur.weebly.com/uploads/1/3/5/3/135316586/nurarowikakel.pdfIn PDF document text
    • https://cdn.sqhk.co/ridijafugemi/bsWjghf/mivomajiburije.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494431/normal_5fe15a35df77c.pdfIn PDF document text
    • https://tifitafi.weebly.com/uploads/1/3/4/3/134390202/nugurawijasazex.pdfIn PDF document text
    • https://cdn.sqhk.co/muluxodipoto/jjYjeLh/amc_24_hampton_lion_king.pdfIn PDF document text
    • https://xemuvexakono.weebly.com/uploads/1/3/4/6/134655393/wezumixejamomevofe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xaligapuk.epizy.com/bezuvodirosiwuwusaku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cca5f13-026c-41d1-8002-5ced618d661f/13595198970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21f3e75d-cc42-4cc1-aab2-383731f745da/28449401544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60495a24-7281-4931-8458-6133645d8503/92412726263.pdfIn PDF document text
    • http://sonupon.epizy.com/lepogosunulema.pdfIn PDF document text
    • http://zokusopejexumub.rf.gd/best_book_to_learn_korean_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12554521-fea1-4951-99d1-0358c2942910/fuel_pump_relay_96_jeep_cherokee_sport.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_off0000fd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 5604 bytes
SHA-256: af08a41a6959556f6d86acf692bfb7a4b0d27feda3611e5b3f6bedf2ab51c16a
font_01_sfnt_off000110ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 10880 bytes
SHA-256: 22c741d800cc8516a14343bdb78e97ce7a9a6d5cc1647423964426e0d9687c1e