Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c67c4bc458759ad…

MALICIOUS

PDF

88.9 KB Created: 2021-04-05 17:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e26ba47d3d7692a1d9d23898c7fbdbea SHA-1: cf05896f5a0e3624e6f731bf4bd8a057e7dc09a4 SHA-256: 8c67c4bc458759ad03386984fbd84e121c33fd1ec1642467e85904ca7cbb2420
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, and ClamAV detected it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a strong intent to lure users to external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/123?utm_term=building+automation+system+definition+pdf PDF link annotation
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/rulerabasa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409405/normal_6020be8ac363f.pdfIn PDF document text
    • https://vefamomapebimid.weebly.com/uploads/1/3/1/4/131406391/01d8f6d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409413/normal_5ff404f606d35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444874/normal_6017520b6c68d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499972/normal_60296784ad6ac.pdfIn PDF document text
    • https://cdn.sqhk.co/nupepewomaxu/jdkLeb2/43936539767.pdfIn PDF document text
    • https://cdn.sqhk.co/wudenedu/BBih43P/real_train_driver_simulator_3d_apk.pdfIn PDF document text
    • https://kofaxikizija.weebly.com/uploads/1/3/4/3/134336932/ruwagideronemi_minezuzu_karesow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476453/normal_6056d2b29629b.pdfIn PDF document text
    • https://pudafakomixi.weebly.com/uploads/1/3/4/5/134506615/b8a9dcd.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/4a48d764-2a0a-462f-a66d-0855cb4e7951/gem_of_the_ocean_play.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea9cac91-103b-4686-a616-79805c67d7be/onn_wireless_mouse_not_working_chromebook.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/brother_sewing_machine_ls-_2125i_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89698e81-26cc-432f-b03c-9816458a5e21/bosejajemujatuxarezij.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/kojabibajevex.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/second_coil_of_bahamut_savage_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/eu4_finland_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d000ec25-ee82-4c75-aa67-6324ccd74dba/sword_art_online_season_4_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c95bbdf-9f04-4825-9e8b-bac042bc35b2/lepowif.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/18517942484.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_off00011bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF0 5416 bytes
SHA-256: b7f4ba90365970c2aa2d35e5d021a31d55274e17504439b64cde8aad82f0cfe2
font_01_sfnt_off00012e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5E 11808 bytes
SHA-256: 03dde651c38f8631d26ccdcf10e948c4fcb8e64578217afc04d0f63ebf5936d4