Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a21eb8926fe529c…

MALICIOUS

PDF

91.2 KB Created: 2021-03-31 15:40:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0713bfdb6f095d2ca8129c1bba824da3 SHA-1: 52c9e53f063504e91e950c87018bc4b931d622c1 SHA-256: 7a21eb8926fe529c868b1e823a089715bffb46ea74d42f15049771a1962c0e49
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://resalured.ru/strik?utm_term=jackson+json+tutorial+java PDF link annotation
    • http://mosquito.codes/61148867169bf8aj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377408/normal_6006a02174643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_5fd96b404a761.pdfIn PDF document text
    • http://helpcenterbusiness.xyz/how_to_manually_remove_lavasoft_ad-_awarev2eq2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488329/normal_600baa771867f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5fd7f792543dc.pdfIn PDF document text
    • https://cdn.sqhk.co/pipagalax/heQSb6o/skid_rally_drag_drift_racing.pdfIn PDF document text
    • http://koprovk.xyz/nothing_but_the_blood_of_jesus_casting_crowns_chordsa78il.pdfIn PDF document text
    • http://futup.ru/97250972078cwek0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495696/normal_6036b5164b003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368756/normal_601ef2becf594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478664/normal_6055acf2a067c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459170/normal_60503a4f7b00e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402721/normal_60021b044013c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489414/normal_5fcf5e872af04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481052/normal_6059eb4d6eb89.pdfIn PDF document text
    • http://rineset.xyz/53641965531qon8h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456712/normal_60630305a59d6.pdfIn PDF document text
    • https://cdn.sqhk.co/bemememu/bhghejf/60079887989.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/gghHjaV/17585685723.pdfIn PDF document text
    • http://profapp.pro/chambers_of_commerce_health_claim_form918ra.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 7

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12896 4984 bytes
SHA-256: 716a7aecc91664117f395eea24d17aa486f26386de596c103aec529108fdc4a1
font_01_sfnt_off000139a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A7 10988 bytes
SHA-256: 9588799575ca0abbf52336a2dde409d3648ce78bc57b980c28c953f4656ba871

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