Malicious PDF — malware analysis report

Static analysis result for SHA-256 58682e9101a5daa4…

MALICIOUS

PDF

79.2 KB Created: 2021-03-20 23:34:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: eb4e15f116a37f3f3b9afeb0593d2cdf SHA-1: e47e062d6ef628f384586806776a43a8bcc76279 SHA-256: 58682e9101a5daa450b8a22b82f266e62aa28190f85de274ddab6149e2ed8c66
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external URIs pointing to disposable hosting, suggesting a link farm designed to obscure the true malicious destination. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no direct instructions or lures are readable. The presence of external URIs and the overall structure strongly suggest this PDF is part of a phishing campaign, likely leading to further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/123?utm_term=manifiesto+animalista+pdf+gratis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4373271/normal_5ff03216bade7.pdfIn PDF document text
    • http://morasufas.iblogger.org/adobe_reader_9_mac_free.pdfIn PDF document text
    • http://vugaganopofom.mypressonline.com/16970275057.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/31004150284.pdfIn PDF document text
    • http://fomuvegikutidob.iblogger.org/splash_screen_android_studio_example.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/como_agua_para_chocolate_personajes_descripcion.pdfIn PDF document text
    • http://xozivupanivos.22web.org/digabaner.pdfIn PDF document text
    • https://cdn.sqhk.co/noretokujazo/biautgi/30365991885.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/waruvepebir.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/hvggija/buzz_lightyear_space_ranger_spin_disney_world_ride.pdfIn PDF document text
    • https://cdn.sqhk.co/xadelakora/s1Vjehj/super_street_fighter_4_pc_system_requirements.pdfIn PDF document text
    • https://cdn.sqhk.co/fewoxenovof/pjdoBIS/zejevujegafuwu.pdfIn PDF document text
    • http://vobigabifinu.22web.org/wosatowatefobubebativoge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468838/normal_604832edd44d8.pdfIn PDF document text
    • https://cdn.sqhk.co/fomezawelud/hirDbp8/29948156737.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3625c57-c331-486e-b6cb-f9aaad3c3e0a/hs_mini_maxx_tech_support.pdfIn PDF document text
    • http://masuravapenu.rf.gd/92531238487.pdfIn PDF document text
    • https://8650d040-a33d-467d-a608-6706f181f11b.filesusr.com/ugd/61b8bf_a896e6310ac24c11954966a42748d6de.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/895ae3cf-823e-47aa-b66a-52651ee51e62/zobidediz.pdfIn PDF document text
    • https://951e66c5-660f-4748-bfcc-a6cc0831133d.filesusr.com/ugd/4967bb_78b7ef12795941878d3664baba4e1a56.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c865cb27-e6c3-4860-8368-719663d80c11/selenium_webdriver_sample_projects_in_java.pdfIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_2c4210e808fb4a04afb9bd911ccd13ad.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_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 5364 bytes
SHA-256: 33e181698e154bcc96d7f7ea9b673577ffb4090dbb065d6baf8709682273c6ef
font_01_sfnt_off00010a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A31 10920 bytes
SHA-256: 1e069823299e148eab9220168ed90b84b692a1abe67d0909d7a64f92a32ca695

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