Malicious PDF — malware analysis report

Static analysis result for SHA-256 da42c8710670f85a…

MALICIOUS

PDF

63.0 KB Created: 2020-12-16 19:22:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fe92088c86ecb1ac5e5aed7943be3f02 SHA-1: 745528211795a40f81f2c7445277ea880964a765 SHA-256: da42c8710670f85a934ce71aa08ff11665163deacfca94d70b5a442a34a8ece1
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm designed for SEO, containing numerous external links. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The primary malicious URL identified is traffset.ru, which is likely used to distribute a second-stage payload or redirect to a phishing site.

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
  • 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://traffset.ru/123?utm_term=twin+shot+unblocked PDF link annotation
    • https://tuwazumabokanif.weebly.com/uploads/1/3/4/6/134611666/golipur_diloruruva.pdfIn PDF document text
    • https://tojaluteder.weebly.com/uploads/1/3/4/3/134384479/mikexata_supajuvedabak_tazavar_jegij.pdfIn PDF document text
    • https://rabexowubomisuw.weebly.com/uploads/1/3/1/4/131407155/sazevis.pdfIn PDF document text
    • https://rigitugatelimo.weebly.com/uploads/1/3/4/1/134131632/1100726.pdfIn PDF document text
    • https://jinerepesejo.weebly.com/uploads/1/3/4/5/134576949/lojuwuxonuzojejofe.pdfIn PDF document text
    • https://pabenegoje.weebly.com/uploads/1/3/4/3/134348732/wojekipik_ketudetivarekam_barexuwibedi.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/xilasisefi/kinesiologia_deportiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe32fafd-1748-4bd2-80d3-f952737eb373/857289153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29a0e875-19a1-4a74-893a-fef3fdf84672/week_5_challenges.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/agnathavasi_ringtones_naa.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/fubuzesutisebux.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_off0000bc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3B 4968 bytes
SHA-256: c65c9317117c95aa7bcf93f43bd11cb5d4fede7807f874d1ee31f2c94c1e0082
font_01_sfnt_off0000cd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2F 10120 bytes
SHA-256: 7a6a76a3c8195c5fd5525260dfbe7b4a30483477c10bcbc8f74710c0db102b9a

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