Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1b5c8f4d2a0150…

MALICIOUS

PDF

71.7 KB Created: 2020-11-24 04:30:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 01d793e016c442eb9b1c3632c126cb0f SHA-1: b77655813cb5ae07107e9baf47e6dec6195ec58f SHA-256: 5c1b5c8f4d2a015045eabcae0d45fd5542fcba4fa18e88e783fc4fdd929321a0
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure the true malicious destination. The presence of URLs like 'https://trafffe.ru/strik?utm_term=phoenix+rc+torrent' further supports a phishing or malware distribution lure.

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://trafffe.ru/strik?utm_term=phoenix+rc+torrent PDF link annotation
    • https://mesenogixu.weebly.com/uploads/1/3/4/7/134736765/9987573.pdfIn PDF document text
    • https://vagesazo.weebly.com/uploads/1/3/4/7/134747595/9b03fc3916439.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/sesakaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369782/normal_5f8c07b2e3356.pdfIn PDF document text
    • https://riseriku.weebly.com/uploads/1/3/4/5/134585500/7588761.pdfIn PDF document text
    • https://nuzilemuf.weebly.com/uploads/1/3/4/4/134479477/bosuzurasen_kuxuvin_vodegi_kaputifanawam.pdfIn PDF document text
    • https://jipunexekamu.weebly.com/uploads/1/3/4/5/134588935/59565b159.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lezopobigeza/12711302254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87626c9e-0bf8-4957-851e-c00877f6d4f2/78033379467.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/sexaxusaluvudefad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb2a9dc0-5bea-48dd-8c02-03f66b1afa73/half_orc_fighter_images.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/23440293002.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/77798831460.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/tozovaxadala.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_off0000cd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8E 4324 bytes
SHA-256: e627c273a1c1b3d3716c8d11607a87e96fbf39381a3fd757b5a83b0bbd36e8dd
font_01_sfnt_off0000dc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC24 11992 bytes
SHA-256: 06e00f18ca6b6c6401cd04dd7ccbac38a1119c83ac5cae7ca16418e9ed35f9c3
font_02_sfnt_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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