Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f0cfd1a9ed5e55…

MALICIOUS

PDF

86.7 KB Created: 2021-03-21 00:24:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bdbe82b46e5f174ce63ee6053019fff4 SHA-1: de3ca6ebfd115a8ae81bf62414423a0621908538 SHA-256: 61f0cfd1a9ed5e55580009b8e71de8ca8132bd27c51571642a9ec40d79f99b2f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=apa+style+quiz+quizlet PDF link annotation
    • https://cdn.sqhk.co/pakebisas/hjf5Fhc/download_roller_rush_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488090/normal_5fcdd04c06c15.pdfIn PDF document text
    • https://cdn.sqhk.co/sujutowupolu/ibKwZhg/mars_robots_ultra_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/cRidiex/sakura_school_simulator_apk_uptodown.pdfIn PDF document text
    • http://itabody.space/cambridge_secondary_checkpoint_past_papersypbfp.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/d1Chejj/us_army_stickman_rope_hero.pdfIn PDF document text
    • http://gepanukotex.getenjoyment.net/ciencias_formales_y_facticas_definicion.pdfIn PDF document text
    • http://kasyanbeauty.com/42326404331bot2k.pdfIn PDF document text
    • http://tomokatixo.mygamesonline.org/yaesu_ft-450d_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/4rqYQjc/cyclebar_around_me.pdfIn PDF document text
    • http://pro-konditer.com/77858635158mq4dp.pdfIn PDF document text
    • https://cdn.sqhk.co/motakolilo/icijhh2/vubugu.pdfIn PDF document text
    • https://cdn.sqhk.co/toxotunem/egehahg/gifusiraresiduxatuxarifol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444869/normal_5ff095895806e.pdfIn PDF document text
    • https://cdn.sqhk.co/sirejeforox/Khgczgj/10864146871.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
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_be81144553f441ac979d07a1f5e2798c.pdf?index=trueIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_82efffea65ce41b6893ecb4fe3de973e.pdf?index=trueIn PDF document text
    • https://6c639bf1-704a-4500-b661-329758898742.filesusr.com/ugd/02d620_8f9a0364763249b79fef6c63ad3b05e1.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D4 4652 bytes
SHA-256: d969e6c752b9e99628d21a22355932a7e0cb46088b53d202176f78f8126aebd8
font_01_sfnt_off000117bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BB 11172 bytes
SHA-256: 3aa7dcbf3b76cae078673645bb620ea3336f956d7bfb3e35b6205d72b45497db
font_02_sfnt_off00013dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC0 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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