Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6b984c2f236c55…

MALICIOUS

PDF

104.5 KB Created: 2021-04-02 11:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e95569dd28dc2e051ee3b8b95ce46f4c SHA-1: ca3b12c03bd581ae36e1cbb6e8f40d8b8b2bebbb SHA-256: aa6b984c2f236c55eef1b87c38ca385cabb05700f99c8b75b787bc37c2c2048a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains metadata related to 'Netapp hci deployment guide' and 'wkhtmltopdf', which could be used as a lure.

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://druttle.ru/123?utm_term=netapp+hci+deployment+guide PDF link annotation
    • http://lavkavkusa.store/kagazezozosunevc11r8.pdfIn PDF document text
    • http://fisitupogavi.mypressonline.com/nilatujiku.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/cqm5uKY/55114819168.pdfIn PDF document text
    • https://cdn.sqhk.co/janurisu/6WOihig/77231771901.pdfIn PDF document text
    • https://cdn.sqhk.co/sewuvavimebi/jnVjd9q/74401400311.pdfIn PDF document text
    • http://busibear.com/53332278230epm7c.pdfIn PDF document text
    • https://cdn.sqhk.co/rigedaveva/bjthfie/67964050046.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495681/normal_605a3ecee1065.pdfIn PDF document text
    • http://rimujitibux.mypressonline.com/pixef.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/bergey_s_manual_microbiology.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483097/normal_5fcb128cd6264.pdfIn PDF document text
    • http://interior.estate/what_do_u_mean_by_mechanical_engineering_designtwanl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383295/normal_6065ed052c525.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://losinglotterynumbers.com/game_centre_app_androidouu0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408346/normal_5fcca6becf27f.pdfIn PDF document text
    • http://:442/nde/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/dejoditagowon.pdfIn PDF document text
    • http://saboveliga.myartsonline.com/arcadismo_portugues.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/58209340109.pdfIn PDF document text
    • http://guxejusoselota.myartsonline.com/sistema_endocrino_que_es.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_off0000f685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF685 32804 bytes
SHA-256: d651b9006e7de833362e826e3cc25dfb726dcb1a90c171707e05d8e0e40bf356
font_01_sfnt_off00015c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C77 5284 bytes
SHA-256: e801bc1e3d119519d45be8533686c0e96144c4c537cc8d32fa90345fa3946c9f
font_02_sfnt_off00016e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E5B 11272 bytes
SHA-256: fe87f9e7b3d428409b0f8b0502090e8a8f167884cfb18558b447e10f08a73c4c

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