Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c6f67b0d8f8c4a…

MALICIOUS

PDF

77.5 KB Created: 2021-05-15 01:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c8955017947cbae4904d1f999bbe8afc SHA-1: 213bbe0af5942454524afa8ea43a4fb7ab85a7c5 SHA-256: e7c6f67b0d8f8c4adcd59070b611f4992b5b4a696ce4058e8d8bb570d736ae4c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, with a primary focus on redirecting to a URL that appears to be part of a link farm designed to obscure the ultimate destination. The document body, though heavily obfuscated, suggests a lure related to 'system control'. No scripts were extracted, but the presence of multiple disposable and potentially malicious domains points to a phishing 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://baarspo.ru/strik?utm_term=what+is+system+control PDF link annotation
    • http://beduzevitugok.mypressonline.com/dovejefopapejeloresiro.pdfIn PDF document text
    • http://vykupavto54.ru/probability_igcse_questionsg8pfr.pdfIn PDF document text
    • http://getchambre.xyz/11795932436k7c8o.pdfIn PDF document text
    • http://sellamorem.com/740247950388mzi9.pdfIn PDF document text
    • https://nokojuponamipi.weebly.com/uploads/1/3/4/8/134891784/1613232.pdfIn PDF document text
    • http://fafesixokegigi.getenjoyment.net/39535254017.pdfIn PDF document text
    • https://vuvudarekiw.weebly.com/uploads/1/3/4/0/134017261/7dbb34fb2.pdfIn PDF document text
    • https://zunejafeg.weebly.com/uploads/1/3/4/3/134382709/zedokesofel.pdfIn PDF document text
    • http://winoorama.website/essentials_of_negotiation_lewicki0c0fv.pdfIn PDF document text
    • https://dujisiseruw.weebly.com/uploads/1/3/0/7/130776106/9516040.pdfIn PDF document text
    • http://levantemosaic.com/617464550138nqe6.pdfIn PDF document text
    • http://buloshnaya.site/fosewibemikagexaxomupu6pvbs.pdfIn PDF document text
    • http://beststudent.space/capsa_susun_diamond_apkkmfp6.pdfIn PDF document text
    • http://winoraama.fun/gumubaxineleko98lz9.pdfIn PDF document text
    • http://bufo.online/bapukudafep40qh.pdfIn PDF document text
    • http://mokuduvejevuz.scienceontheweb.net/algebra_worksheets_grade_10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lobexot.epizy.com/impossible_game_16_answer.pdfIn PDF document text
    • http://wipadafefuxasi.onlinewebshop.net/dumuporumokofo.pdfIn PDF document text
    • http://vezigaje.epizy.com/pevevofaposagumomuzozo.pdfIn PDF document text
    • http://lobobeges.epizy.com/the_cult_of_kingship_in_anglo_saxon_england.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_off0000f4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A4 5156 bytes
SHA-256: a7e695fdb6913d1e9a9001387f579bc0ea5f467131297e9ec8fbbf20d6dbde52
font_01_sfnt_off00010611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 10112 bytes
SHA-256: 8e0b339dadb190e35c433d11a6958dbf1b0986856f58c0fc6c99929f52e07068

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