Malicious PDF — malware analysis report

Static analysis result for SHA-256 7354f708fc70e8c4…

MALICIOUS

PDF

75.4 KB Created: 2021-03-29 00:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 81b9e998b0357b8d6163916f83caf6aa SHA-1: 5a6190274ada5a9f2429fe4221832ff294c9ce67 SHA-256: 7354f708fc70e8c4bd1a277a787136a14007d6114d46594d4ba0c21352adde1f
186 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. 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 0.9998

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://jacksth.ru/aws?utm_term=how+to+setup+vizio+soundbar+to+roku+tv PDF link annotation
    • http://ludesajezopaju.medianewsonline.com/kenmore_washer_will_not_spin_heavy_loads.pdfIn PDF document text
    • http://wikotimu.scienceontheweb.net/4874569941.pdfIn PDF document text
    • http://terugate.mypressonline.com/lion_the_witch_and_the_wardrobe_movie_review.pdfIn PDF document text
    • http://zonuvak.medianewsonline.com/2415062084.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/best_printable_heat_transfer_vinyl_uk.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/how_many_cups_is_a_medium_sweet_potato.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc3dee6e-f36a-4e80-a677-5250debdfc89/poxesekajolexepipagirirat.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_739f0ecdf3894f81975f8a57af510e6d.pdf?index=trueIn PDF document text
    • http://guwaxilajoxeza.onlinewebshop.net/18757322783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5ca879b-66a7-4946-83ae-a50065c9b53e/sidewifususevosomi.pdfIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_047c8b6285b14491803e18ed731a7df5.pdf?index=trueIn PDF document text
    • http://sujetokotew.rf.gd/g_shock_5081_battery_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acc698a8-7a2c-4531-8aec-9ed0931c8091/bufuluvop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e640b6-dc18-479b-acc1-b5005e3ccb47/mujodunokuju.pdfIn PDF document text
    • http://witesenigo.atwebpages.com/why_did_the_us_want_hawaii_so_bad.pdfIn PDF document text
    • http://wenares.myartsonline.com/81306660957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8eb81ed-8e8a-4121-a96f-16dac5edb119/how_to_maintain_hope_scholarship.pdfIn PDF document text
    • http://jebafokar.rf.gd/dupurikituzimazawimagisu.pdfIn PDF document text
    • http://kodireso.epizy.com/vuvulonodifi.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_off0000e767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE767 5288 bytes
SHA-256: 5d381699abe2018678c1a6706b57304cc017979a2836ad75321d1a8028d46b86
font_01_sfnt_off0000f989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF989 10904 bytes
SHA-256: 751402cf3d6cec0494127641e425e7722cd6514527e446e03c0934eef87f00e7