Malicious PDF — malware analysis report

Static analysis result for SHA-256 c385207107bfab2b…

MALICIOUS

PDF

79.4 KB Created: 2021-03-09 13:20:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c8b57925be2ac5efa182a1c10206c9f1 SHA-1: 14005fffb3649467ab90c890a79db15ae8b6f9c1 SHA-256: c385207107bfab2b9756463df5248cc22372f38ab86799f49535f0547ddec3fe
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

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://nipisod.ru/123?utm_term=60+days+notice+to+tenant+template+ontario PDF link annotation
    • http://tezibif.mygamesonline.org/holiday_math_puzzles_middle_school.pdfIn PDF document text
    • http://nafuvexozoli.iblogger.org/56233679555.pdfIn PDF document text
    • https://bevabuje.weebly.com/uploads/1/3/4/8/134897483/c5af46.pdfIn PDF document text
    • https://jalusuduzewot.weebly.com/uploads/1/3/1/4/131456012/rexoba.pdfIn PDF document text
    • http://sunepoxuvigos.66ghz.com/81347582510.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/35784821084.pdfIn PDF document text
    • https://bafexobis.weebly.com/uploads/1/3/4/0/134041027/zaforokuwen.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/61699894779.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gateme/foster_city_police_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/how_to_draw_animations_on_computer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab94095d-f95f-46d2-b699-c90a2a7894eb/how_to_use_a_mirro-matic_pressure_canner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ef70b12-1a73-49d6-8362-9e881ffbadbf/26028739872.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20d84f86-d92c-4ea6-89bc-dced8dc2d547/amcor_portable_air_conditioner_kf9000e_parts.pdfIn PDF document text
    • http://duguteterexu.epizy.com/wazuseguzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5eca611-6c66-4bc8-911d-4d898d111557/nagipebosepovikemi.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/nofefezapebegofomi.pdfIn PDF document text
    • http://jubegovasoranaz.rf.gd/16431377171.pdfIn PDF document text
    • http://kudogal.rf.gd/kemeki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acb4f46f-035e-4963-9a1e-1283e9751537/how_to_measure_hoop_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6fa4cff-a5ae-44c6-8754-d8780bc79464/what_is_bear_in_native_american.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93448c7f-a722-441e-9052-2beccbcd81f2/wuxiwisudekobewigojejevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a237634-2341-4c0a-a6b3-85e4f82b017d/angel_technology_ltd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/277a2ab4-ea9d-4b5a-8e39-8338f18c9532/13643172921.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE448 5524 bytes
SHA-256: 83a795a932848b2b6c0dd3656e81ba49dbd9641397788526dea6be9fd30803ef
font_01_sfnt_off0000f6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FC 10436 bytes
SHA-256: 2a03d12a6a2778e96fb5e320af6df8c6194b271c5ecdeae30716e83e71d0a8b1
font_02_sfnt_off00011aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAD 16140 bytes
SHA-256: 3f83bbfb2e03141a9083badfb1da6e2b1773f9aa6b1ed8f30fc2d392a5ee3553