Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f85e998dc87fb5…

MALICIOUS

PDF

86.8 KB Created: 2021-06-10 09:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 02ed9b41872e006cd0715cbb71684f09 SHA-1: 04a8de3ea6b5eb264b64327eb8684e685f761096 SHA-256: c1f85e998dc87fb5cce867941c2b9589dc5941f9d09a6151ec8d7361a11d8cd4
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous external links, many of which are hosted on disposable domains, and uses irrelevant keywords in the document body to potentially lure victims. The primary malicious activity appears to be redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pixomot.ru/pbw?utm_term=warhammer+40k+psyker+build PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388293/normal_5fdc34d7b5738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486758/normal_601c69c84b6d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487647/normal_601464fd74a29.pdfIn PDF document text
    • https://xelasukozulete.weebly.com/uploads/1/3/2/6/132681542/1dfe4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470385/normal_600ff4f8e52d6.pdfIn PDF document text
    • https://naluzamuro.weebly.com/uploads/1/3/4/5/134516405/8888859.pdfIn PDF document text
    • https://moxudula.weebly.com/uploads/1/3/4/8/134884970/podojutazudure.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/ce46edbf-d7b3-4b6d-ac72-95b0673c2cce/75231637799.pdfIn PDF document text
    • http://rixepal.pbworks.com/f/38327155098.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b314fda1-f764-40ff-8f05-5a7af80eb011/dufuwiwoxorek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3804c6fb-709b-4416-8581-6bdc429c5948/qu_se_siente_cuando_uno_tiene_reflujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5673790e-b0dc-4fe1-aebe-e56e22b52381/how_to_set_a_whirlpool_dehumidifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f59ce390-e7c1-447a-92ef-d12d8cd86b54/23663947554.pdfIn PDF document text
    • http://labidan.pbworks.com/f/the_scorpion_king_2_full_movie_in_hindi_download_480p_worldfree4u.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fca3282-34f9-40dd-b109-242436c3d342/bonjour_tristesse_english_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68601148-dde8-497b-ba02-ebeee824cae0/sap_hana_mm_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e52c7876-22e5-4bbd-95ea-ae225073f3c5/melakuturanetiwarutifogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f514d6-9ed8-4b40-9bee-5e4c4e9d7ae5/mugunubima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0975f3b6-948f-4229-b6b7-2a30752163ee/zegarek_casio_g-shock_original_bluetooth_tough_solar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2099f181-c057-4490-84c6-502eea75da9e/2329979693.pdfIn PDF document text
    • http://xuwuziz.pbworks.com/f/mormon_female_dress_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/539adcea-87d0-454e-b365-43ccb1bf1bae/do_tracfones_have_hotspot.pdfIn PDF document text
    • http://gudikijuruf.pbworks.com/f/sududevijegefase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d8d90a8-3f57-434b-b850-960ade4d0de5/how_to_calibrate_small_digital_scale.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_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 5748 bytes
SHA-256: 840327016265d7d8c37238d7b627f2f94bb8d45e19f31f902db416da648a73cd
font_01_sfnt_off00011285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11285 10628 bytes
SHA-256: 34aa1441b1f13e03990f94dc1cd447fa9137c7b1e997734a96099ecfc9e8b86f
font_02_sfnt_off000136db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DB 16196 bytes
SHA-256: 13873d145b8da2256cc9aff7ec32aedf7dd7de0e65fabb376e0f91dd1eea3996