Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0cd8d0025e01110…

MALICIOUS

PDF

73.5 KB Created: 2021-03-04 04:09:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fd0bf3aa8953241bfad208854c911a12 SHA-1: d9f3000945489b447a98e051cb479b2766aa406c SHA-256: d0cd8d0025e01110c80c60e12e0a95c3d6705c450b4404d61bd30e3881317939
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to disposable domains, and a heuristic indicates it functions as a link farm. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/strik?utm_term=gopro+hero3%252B+black+edition+software+download PDF link annotation
    • http://sokfresh.fun/hp_4500_printer_ink_cartridge_replacementoa17v.pdfIn PDF document text
    • http://sy0n.icu/a_single_man9ygei.pdfIn PDF document text
    • http://barashik.space/biwedotego5lqov.pdfIn PDF document text
    • http://reactivaperu-2020.com/viduvonofadezivokaiio28.pdfIn PDF document text
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/8378687.pdfIn PDF document text
    • http://harkateine.fun/48453786221oxwxs.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/RgifRmy/nugisesivirufirivosofel.pdfIn PDF document text
    • https://fosegeluka.weebly.com/uploads/1/3/4/7/134717840/4957931.pdfIn PDF document text
    • http://medyayazilimtr.com/como_traduzir_documentos_em_gratis08amz.pdfIn PDF document text
    • https://vuzufakafedovi.weebly.com/uploads/1/3/5/3/135347170/32f2b3a62236112.pdfIn PDF document text
    • https://xixonulavef.weebly.com/uploads/1/3/2/6/132683080/zusuno_ruwanirurud_diwud_rezumowubimi.pdfIn PDF document text
    • http://presentinsta.online/vistaprint_postcards_template8aeod.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/kujesulad/56590538456.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_off0000df97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF97 5732 bytes
SHA-256: e367a133ce9fd31126e2100dc1afe57c98a17006702b9ff6cdbe71f391538b7c
font_01_sfnt_off0000f31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 11600 bytes
SHA-256: 77305ddb78234e7825f92b45082570c09d05cf55244629213a389b725e35f6c5

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