Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba9b79942eb4667…

MALICIOUS

PDF

78.2 KB Created: 2021-03-17 11:26:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 2c7b29d58b1248370228092c5be6f4ff SHA-1: b5dd610cbd149cc23c8f3d25d2aac4343a1af17d SHA-256: 4ba9b79942eb4667d27543a48064e3d05560cd44aa8f5f5cd8628e2e87d9c24c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links pointing to other PDFs hosted on disposable domains, a common tactic for SEO manipulation or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest a phishing or content distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jumiwimov.ru/wix?keyword=metaphysical+stores+open+near+me PDF link annotation
    • http://betizekaxu.getenjoyment.net/49688493004.pdfIn PDF document text
    • https://simipupipez.weebly.com/uploads/1/3/4/7/134716676/5714612.pdfIn PDF document text
    • http://posadukik.getenjoyment.net/mamiya_rb67_lens_stuck.pdfIn PDF document text
    • https://sarutofujatazix.weebly.com/uploads/1/3/4/5/134584212/fowoket_ludum_karuti_tidebutugiwus.pdfIn PDF document text
    • http://salimom.mygamesonline.org/linear_algebra_a_modern_introduction_4th_edition_david_poole_download.pdfIn PDF document text
    • https://nerapusu.weebly.com/uploads/1/3/1/4/131438180/difevezapax_nufowogexane_niledebe.pdfIn PDF document text
    • https://siwurarililoto.weebly.com/uploads/1/3/1/4/131453181/d0687ce5.pdfIn PDF document text
    • http://kudukudimox.sportsontheweb.net/how_to_deregister_a_panasonic_phone.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/shadowrun_weapons_guide.pdfIn PDF document text
    • http://jerabigemoz.sportsontheweb.net/64467532040.pdfIn PDF document text
    • https://vavaxurose.weebly.com/uploads/1/3/0/7/130775274/e01087a5fc39f.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/99_topics_ccfp.pdfIn PDF document text
    • https://tijesefufejeje.weebly.com/uploads/1/3/4/8/134858706/jubepek.pdfIn PDF document text
    • https://bozetefaz.weebly.com/uploads/1/3/4/7/134733050/a5182f42d10b115.pdfIn PDF document text
    • https://pavadugubuwab.weebly.com/uploads/1/3/4/3/134309483/3704140.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_34eaa82c843c4f63907886274fabcc54.pdf?index=trueIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_24496855f95a4950b0f7b6ca6891fb4e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3b8be7e-8427-4db4-a2bf-20e9f7ef8730/30316634077.pdfIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_2db6eecafc3943cd8563d522a7b1c626.pdf?index=trueIn PDF document text
    • http://rewuwuja.onlinewebshop.net/sozewusibu.pdfIn PDF document text
    • http://gevapugono.atwebpages.com/how_to_read_love_line_on_palm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3fa21bf-bc0c-488d-b944-7b040e1113a1/69740106768.pdfIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_502ba5250b43464ea3173c2943e14a8d.pdf?index=trueIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_b6ca2d31100646cab0bde94be5ff5b36.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/371c82b6-633e-474a-8e79-1b6728267b1e/63041026302.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 5280 bytes
SHA-256: 8a47bfe017e1c1b9d53656985b467703e3209be85e89748f0e5983bfa828ee3c
font_01_sfnt_off000104eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 11288 bytes
SHA-256: 0a933202888f57fd268638dfe789a9e5bae3852b4b0a4e970dbd15ad9dec23f1

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