Malicious PDF — malware analysis report

Static analysis result for SHA-256 b918122c53f58f7d…

MALICIOUS

PDF

77.5 KB Created: 2020-12-30 23:51:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d91372a9d1d78361aa0f33bd4069ae5e SHA-1: 6b7a776a1284547a330d124c754140845d11a0a8 SHA-256: b918122c53f58f7def7bebb9c6cd1433bdc33cea1d41a873ea9f6f6c988d7809
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The heuristic firings indicate the document is designed to lead users to malicious infrastructure, likely for phishing or malware delivery. The ML classifier strongly supports the malicious nature of this PDF.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cctraff.ru/123?utm_term=ther+ex+notes+pdf+download In PDF document text
    • https://cdn.sqhk.co/fijajiles/KVgiJic/4979523172.pdfIn PDF document text
    • https://cdn.sqhk.co/miwataxanis/xx7MhjW/16547967087.pdfIn PDF document text
    • https://sawawinuta.weebly.com/uploads/1/3/1/6/131606003/tonop_gorefolub_pimuwo_lawatosejudu.pdfIn PDF document text
    • https://luwojasog.weebly.com/uploads/1/3/1/3/131380471/nojadaxaxemozopasa.pdfIn PDF document text
    • https://peneredexamoje.weebly.com/uploads/1/3/1/4/131407565/medutazupima.pdfIn PDF document text
    • https://cdn.sqhk.co/rasufizo/LXjbrie/85318164959.pdfIn PDF document text
    • https://cdn.sqhk.co/dabeluza/jjDu89P/vililesofetojumubozusepa.pdfIn PDF document text
    • https://fojakodi.weebly.com/uploads/1/3/1/3/131379163/gewetinijiti-sizevotixo-xudabi.pdfIn PDF document text
    • https://boxavaruju.weebly.com/uploads/1/3/4/7/134759985/8436418.pdfIn PDF document text
    • https://cdn.sqhk.co/tupipitijil/djemwhg/65764235260.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/nowokil/printer_not_responding_canon_e470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a90956b8-fe96-42a1-a398-d1a1cbcd7fed/san_antonio_spurs_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/77090264008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd49345-1c68-44ca-a5f7-d188904feef2/european_pharmacopoeia_2019.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_off0000f277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 5240 bytes
SHA-256: 70a4dcaec7503ed2ff34fcd5a94b73fd17d7c4bbb20d285e7da01949face42f7
font_01_sfnt_off0001045a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045A 10736 bytes
SHA-256: 297bc39448b7f247a240fe106b6c71c09a06471dce926fad1255e5e727e51608

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