Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e870fdd9b5c2574…

MALICIOUS

PDF

71.6 KB Created: 2021-01-20 06:44:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8a26e4a09b3bed3b5b7c03919b57bedc SHA-1: e93b18cd8108184332b18b5a66363394544a4339 SHA-256: 6e870fdd9b5c257408e1a610c37be38b39f62ccf875f7268746be322ac5afb2e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=the+things+they+carried+discussion+questions+and+answers PDF link annotation
    • https://site-1176262.mozfiles.com/files/1176262/plants_vs_zombies_2_garden_warfare_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374380/normal_5fb499ec3322b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417519/normal_5fa4c82bd2721.pdfIn PDF document text
    • https://site-1171549.mozfiles.com/files/1171549/ligabugader.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421764/normal_5fa1a8dbd8e52.pdfIn PDF document text
    • http://ladidoxa.iblogger.org/xafupazadamofe.pdfIn PDF document text
    • https://site-1199794.mozfiles.com/files/1199794/kenabapemeli.pdfIn PDF document text
    • https://site-1177349.mozfiles.com/files/1177349/fujajesipol.pdfIn PDF document text
    • https://site-1244875.mozfiles.com/files/1244875/dapox.pdfIn PDF document text
    • https://site-1167954.mozfiles.com/files/1167954/12699617608.pdfIn PDF document text
    • https://site-1084247.mozfiles.com/files/1084247/vemawubatevobewigowene.pdfIn PDF document text
    • https://site-1175702.mozfiles.com/files/1175702/50553356773.pdfIn PDF document text
    • https://site-1177296.mozfiles.com/files/1177296/lasileniputibanovivuwuri.pdfIn PDF document text
    • http://nidikasuzarola.iblogger.org/16976383238.pdfIn PDF document text
    • https://site-1178934.mozfiles.com/files/1178934/wexijubakifekironemi.pdfIn PDF document text
    • https://site-1199244.mozfiles.com/files/1199244/catholic_cardinal_virtues_worksheet.pdfIn PDF document text
    • https://site-1177662.mozfiles.com/files/1177662/sweet_crossing_snake_io_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB40 5440 bytes
SHA-256: 5b2371eecb38b6b42bba1d5ebc5cb9fa59476de1b67a5a78bb832355bdb8271a
font_01_sfnt_off0000edce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCE 10340 bytes
SHA-256: 2f5c5a974f3ed89a12904c73e900deaff961b4bdaee45deb1b6fb51710a1f79f

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