Malicious PDF — malware analysis report

Static analysis result for SHA-256 628bad69f6ae6913…

MALICIOUS

PDF

85.9 KB Created: 2020-12-17 15:34:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: aa9474bdcb78980baaed3a726dbb8e3a SHA-1: 9de52f947bee3f62bbf58af935cdedcdadf22ac0 SHA-256: 628bad69f6ae6913bc0880fa37851ba39dd612a56a8de55fa2cb3f160a78a82e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafffi.ru/strik?utm_term=dhcp+relay+agent PDF link annotation
    • https://rixidagetowema.weebly.com/uploads/1/3/4/6/134612143/4941431.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/xewuj.pdfIn PDF document text
    • https://fozivumi.weebly.com/uploads/1/3/4/7/134761275/5127567.pdfIn PDF document text
    • https://jufozovujibozom.weebly.com/uploads/1/3/4/3/134360308/sigufadolexe.pdfIn PDF document text
    • https://gokimojesip.weebly.com/uploads/1/3/4/5/134595710/9267826.pdfIn PDF document text
    • https://kobadibik.weebly.com/uploads/1/3/4/8/134861151/falesupevifuro.pdfIn PDF document text
    • https://vajibenutiw.weebly.com/uploads/1/3/4/4/134487234/perukoxalu.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/ruzumeb/knight_leveling_guide_ragnarok_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b46878b-8d5e-4536-9928-144eeeb897cf/71704433597.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/zupod.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/hp_photosmart_7510_ink_cartridge_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c7e413b-5ddb-413e-9783-9c4a908754fe/zeseb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9A 17628 bytes
SHA-256: 46631f9b8390eb6d59341635028a1901915c8148fa09a647e75d799ad2298219
font_01_sfnt_off00011483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11483 5120 bytes
SHA-256: 332a1c173ee2f5b0fa69e3f71a335a77d6aff6189c2a8d4eeae8d4b9ff8674ef
font_02_sfnt_off000125f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F9 10808 bytes
SHA-256: 8b6acea845588e6cc4bd843d66e4030376c728657fa21791c6baf92151e2ac72

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