Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99c562e082173b9…

MALICIOUS

PDF

85.5 KB Created: 2021-01-11 12:15:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 606a64f6035c9f2324f537f37f0c60e0 SHA-1: 922a3903c150b47cf8339b466fc14c6841096f9f SHA-256: c99c562e082173b96f5204ec8c0917529aed9741e822068c24668340db85641e
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a redirector, suggesting it's part of a link farm designed to lead users to malicious sites. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

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://traffset.ru/aws?utm_term=expeditions+conquistador+quest+guide PDF link annotation
    • https://site-1166598.mozfiles.com/files/1166598/57058554052.pdfIn PDF document text
    • https://site-1196822.mozfiles.com/files/1196822/xipugovabafunuzol.pdfIn PDF document text
    • https://site-1175164.mozfiles.com/files/1175164/11030333018.pdfIn PDF document text
    • https://site-1177736.mozfiles.com/files/1177736/new_guitar_mix_ringtone_2018_download.pdfIn PDF document text
    • https://gelujesu.weebly.com/uploads/1/3/4/8/134847850/fezanibamufaka_seneji_puwopukenoma_pivetexot.pdfIn PDF document text
    • https://site-1168081.mozfiles.com/files/1168081/air_hockey_challenge_mod_apk_download.pdfIn PDF document text
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/gufopokidobitinezud.pdfIn PDF document text
    • https://site-1178035.mozfiles.com/files/1178035/gartner_bpm_magic_quadrant_2020.pdfIn PDF document text
    • https://site-1166680.mozfiles.com/files/1166680/24769805962.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/liwafo/mupifafefoxabasogulo.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/carrinho_de_carga_plataforma_200kg.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/rental_agreement_template_word_ontario.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_off00010f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F90 5360 bytes
SHA-256: 62248519fd6f259d7be867dacb8a63c98bf5d5e192874fa79e323c1e6bfe078c
font_01_sfnt_off000121d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D9 11624 bytes
SHA-256: ddb38b935da0763823f047350349d64f21666cc5d72db2e0612382e37b3a1143

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