Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a930a7bf31bd787…

MALICIOUS

PDF

77.9 KB Created: 2021-03-02 23:29:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5411ed91ce74d4336c26fa2a9dbd4cf0 SHA-1: 16492d7b87ce6b7e75c039a17832ea556d6c15f3 SHA-256: 1a930a7bf31bd787e5bb9737a3661056db0794fcdbb3ef284015855cc4b1ff9b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://mezovuduw.ru/strik?utm_term=best+riding+lawn+mower+for+steep+terrain PDF link annotation
    • https://cdn.sqhk.co/xegunorasu/4Vibji6/skyscraper_cast_1996.pdfIn PDF document text
    • http://jofijuke.22web.org/26471693723.pdfIn PDF document text
    • https://cdn.sqhk.co/tenotitur/X6gfhhS/55744442528.pdfIn PDF document text
    • http://xilenemivagola.mywebcommunity.org/how_much_is_a_jack_worth_in_cribbage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414866/normal_602b5f55412dc.pdfIn PDF document text
    • https://cdn.sqhk.co/mekibekowufe/ghXjagR/physics_balls_on_a_string.pdfIn PDF document text
    • https://vitekasawo.weebly.com/uploads/1/3/4/4/134456264/377809.pdfIn PDF document text
    • http://majubavilusuda.iblogger.org/man_city_wolves_match_report.pdfIn PDF document text
    • https://felunazajejo.weebly.com/uploads/1/3/5/9/135959991/metovojewof.pdfIn PDF document text
    • https://tokemata.weebly.com/uploads/1/3/6/0/136081978/tidekuwizisufev_lufugemuma.pdfIn PDF document text
    • https://zokeperivixif.weebly.com/uploads/1/3/4/3/134307771/5591830.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sasezer.rf.gd/modabefulatevude.pdfIn PDF document text
    • http://gafodix.myartsonline.com/49730462521.pdfIn PDF document text
    • http://nogomazarem.epizy.com/bubbleupnp_android_cracked.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_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 5292 bytes
SHA-256: 2c5be044ff72b0166c7c5e15f9638663e0f07422f3fa9b03a7392d7ebb39ede3
font_01_sfnt_off0000f855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF855 10440 bytes
SHA-256: 0e827489dbdc04f0c6b42f3b63120f5a699217ed3713727b6bf7c4af81dc8dea
font_02_sfnt_off00011c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C00 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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