Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4590bf8f6b28ea…

MALICIOUS

PDF

81.0 KB Created: 2021-01-22 21:41:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 0aab856570c6253da87fbdc19a4e2923 SHA-1: 7e64371c00c80e90c95d153e6eaedf83e8cdda09 SHA-256: 8f4590bf8f6b28ead292a59b10ed3fead958d1f15540680c8b0c933eb4733d0b
256 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains multiple heuristics indicating it is part of a phishing campaign, specifically impersonating Spotify to trick users into clicking malicious links. The presence of external URI and SEO link farm heuristics, along with brand impersonation for credential phishing, strongly suggests a phishing attack. The embedded URLs lead to redirectors and potentially malicious PDF files, indicating a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://vujajewuriwox.weebly.com/uploads/1/3/5/3/135387523/zojikovu.pdf.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jacksth.ru/123?utm_term=roku+2+xd+remote PDF link annotation
    • https://cdn.sqhk.co/raninogozo/gcphjif/sowebuzinagorerine.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366366/normal_5fef61f0114a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450728/normal_5fd7b26e7afc6.pdfIn PDF document text
    • https://cdn.sqhk.co/nudabesawi/jf2Vgir/top_decks_yugioh_duel_links.pdfIn PDF document text
    • https://cdn.sqhk.co/xewimoziwuvo/bhbggid/bream_fish_live_bait.pdfIn PDF document text
    • https://cdn.sqhk.co/zenujulikik/AzkdgeP/wokok.pdfIn PDF document text
    • https://cdn.sqhk.co/matajikiwov/lhjwOij/foosball_world_cup_18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_5fc98fbda0a5a.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/ebRgKia/rush_space_invaders.pdfIn PDF document text
    • https://cdn.sqhk.co/mowasikuso/hebOidD/tiktok_wall_picture_apk_15._0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393639/normal_60060004ee01b.pdfIn PDF document text
    • https://vujajewuriwox.weebly.com/uploads/1/3/5/3/135387523/zojikovu.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/jaloto/6466668594.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/battery_down_md_kd_video.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/70826519960.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/gafuragewixowakulezokesaw.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_off0001011a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011A 4824 bytes
SHA-256: 8dcc979fe4a1f1e38c4ed2be3bd0d3dbd04f708a74e440a7f43011982b47c89a
font_01_sfnt_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 10912 bytes
SHA-256: 0c1391bd476efc247f1c66cd92e0870679113905237275457ce5963dc67ac191

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