Malicious PDF — malware analysis report

Static analysis result for SHA-256 0854aecba3461bc6…

MALICIOUS

PDF

76.7 KB Created: 2021-02-28 07:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ffdd0366ef0d0cf2b4ef2e8277f92daf SHA-1: 9b385ecbbcab8d36a77769c365c4d9a00201cb24 SHA-256: 0854aecba3461bc61ca4ba801dcc1fe3081c00a7b1e9d99ce244dd560b598b6f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/123?utm_term=when+was+the+ds+lite+released PDF link annotation
    • http://texoraw.sportsontheweb.net/what_are_the_four_original_navajo_clans.pdfIn PDF document text
    • http://groshyk.site/tangled_happy_ever_after_full_moviex32bp.pdfIn PDF document text
    • https://sejixegagetuta.weebly.com/uploads/1/3/0/9/130969850/a0c5196.pdfIn PDF document text
    • https://xapefawisago.weebly.com/uploads/1/3/4/7/134771693/luralovufodu_sogud_sufezufilazim_kazenipub.pdfIn PDF document text
    • http://polikarmonolit.ru/ruruvolabedokumopfv08.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/fositibovopuxuduf.pdfIn PDF document text
    • https://motovatexasej.weebly.com/uploads/1/3/4/9/134900011/kejaru.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/college_womens_soccer_strength_and_conditioning_program.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wipadafefuxasi.onlinewebshop.net/jazeva.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/historia_del_escudo_de_costa_rica_para_nios.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_off0000e1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FB 3628 bytes
SHA-256: 4237802d5f06e0279f6f447507c940e0e42a6dca7866eedbe43ef83592dfa521
font_01_sfnt_off0000ef12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 5016 bytes
SHA-256: 12fb429d58acaa8debeb2efa22174115c404f55498d490f621e4104111bc6f3c
font_02_sfnt_off00010031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10031 11116 bytes
SHA-256: b7f4f9942efdd7602427436b672b5dc42d8a3bee27fc36d570e678ea7b97f3af

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