Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3257944d2d27dc…

MALICIOUS

PDF

80.9 KB Created: 2021-03-31 19:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f022f1c6fcb3acade27a878a19943326 SHA-1: 6edcca4fd433200e3c1a9c5da40706a7f15f8d98 SHA-256: 7d3257944d2d27dc75e64b9389bbf7fb05b94f2e23c2396fdbb4bc80361bb2e5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'Couper pdf windows' and 'wkhtmltopdf', indicating a lure to trick users into downloading or interacting with malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gimoguvi.ru/award?keyword=couper+pdf+windows PDF link annotation
    • http://negeduji.66ghz.com/arsenicum_album_homeopatia.pdfIn PDF document text
    • http://tugrull.com/83803225880cpnk0.pdfIn PDF document text
    • http://sravniproxy.info/what_is_a_causal_comparative_research_studyn6o8x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391605/normal_603dc6dd4e155.pdfIn PDF document text
    • http://paloxebesigovo.iblogger.org/corrugated_steel_sheet_norwich.pdfIn PDF document text
    • http://stickerrus.ru/pifobozuvuroxafaxogqssbf.pdfIn PDF document text
    • http://circus.market/viraxelesegusunupimomimofxzi.pdfIn PDF document text
    • http://doweryklkq.space/48411866361nqdot.pdfIn PDF document text
    • http://goodnaturak.space/306338361941or36.pdfIn PDF document text
    • http://brosbass.com/vidmate_ka_optionx2cke.pdfIn PDF document text
    • http://molotkov.site/bodipomeke9g3ye.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505699/normal_5ff257e2cc79d.pdfIn PDF document text
    • http://barojenixumaja.iblogger.org/whirlpool_duet_steam_owners_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446170/normal_601dfa7f751d6.pdfIn PDF document text
    • http://auto-fishing-rods1.club/fufugirafilug8spgz.pdfIn PDF document text
    • http://vawevubigawuti.22web.org/rinefeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403687/normal_60014eaa00ab6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojetewope.epizy.com/23073898235.pdfIn PDF document text
    • http://madulok.epizy.com/85485303610.pdfIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_7d15ad6fe0f54c749e7236ed25f2acfa.pdf?index=trueIn PDF document text
    • http://tefesapebeto.rf.gd/46700866468.pdfIn PDF document text
    • http://bufoxujofepir.rf.gd/82867671009.pdfIn PDF document text
    • http://zofikexegugimum.rf.gd/pejonotisorugogigesax.pdfIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_ada9e0b4ac354844a4634346c3dc2b16.pdf?index=trueIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_56544683194840639ff613e0a916d780.pdf?index=trueIn 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_off0000fdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC4 4788 bytes
SHA-256: 425d4ef0b76543bf6ae7b4a58d63a7cc6ae9aecedba9ab3b8532edeaf5ce3bf3
font_01_sfnt_off00010e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E32 12036 bytes
SHA-256: a28ab5b1726d74d9c6cc639317c815ac81007e5b80ff9a16d3a0daed85711ab4

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