Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40d8091dd530e48…

MALICIOUS

PDF

79.9 KB Created: 2021-04-07 23:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9e76d055cb8c82b3e41a8976d6663be9 SHA-1: 974851b73755f718d10a2afe8d540c5b53da0cef SHA-256: d40d8091dd530e48c6c37679bd78412c66cefcf5eef78db4e80127cdf9887337
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one prominent URL (`https://baarspo.ru/strik?utm_term=vermont+castings+defiant+1975+parts`) suggesting a lure related to search results for specific parts. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` further supports the phishing intent by identifying a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=vermont+castings+defiant+1975+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449185/normal_6067bc02009e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371495/normal_60324a4a44dc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382961/normal_60589ca8895d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_5fd662220ae91.pdfIn PDF document text
    • http://negedibomul.sportsontheweb.net/how_to_balance_in_sbi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403429/normal_5ff006f8295c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494166/normal_601d0a83d2fa1.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/raychem_cable_jointing_kit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450878/normal_5fcd3e3325d48.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laganomezavarof.epizy.com/somewhere_over_the_rainbow_wizard_of_oz_original_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/gobulutekinafobejasasaj.pdfIn PDF document text
    • http://koguxegutoxexu.rf.gd/87735106091.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/kofijogapasodero.pdfIn PDF document text
    • http://ribaxekag.epizy.com/14796404124.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/brianne_metal_and_wood_platform_bed_frame.pdfIn PDF document text
    • http://jonemif.epizy.com/tufofujomizoxenulal.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

Related samples 8

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_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 5820 bytes
SHA-256: 70c933123a817a5efc50f68c3e03d3d528e7399b4ace14b059d00df42c850775
font_01_sfnt_off0001099a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 11536 bytes
SHA-256: 2b40e577f5badcd001555177bb6c8560e184ab4a8c1fe0d28c5d8fc581dba3fd

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