Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bfd1022d746090…

MALICIOUS

PDF

78.2 KB Created: 2021-03-11 01:10:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8ee62f8f9042249f59d0adb8e216dbf4 SHA-1: a14e0ac280aac51f5d57409d470b9b8075e49b55 SHA-256: f8bfd1022d746090840ae1918a51570a743edb06940b7f42b5197605eb819d79
244 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many pointing to disposable domains and Weebly-hosted files, suggesting a link farm or phishing lure. The presence of a link to a known malicious redirector further supports malicious intent. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=top+answers+on+quora In PDF document text
    • https://bafuvigugasud.weebly.com/uploads/1/3/5/3/135308410/4526554.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467273/normal_5ffd63d3ac7bc.pdfIn PDF document text
    • https://mabavelege.weebly.com/uploads/1/3/0/7/130775551/1720672.pdfIn PDF document text
    • https://vevikonupefafo.weebly.com/uploads/1/3/5/3/135391347/9683524.pdfIn PDF document text
    • https://kawawipebezuvo.weebly.com/uploads/1/3/1/4/131409621/fomogot_bigewajivotijo.pdfIn PDF document text
    • https://sozewewivekina.weebly.com/uploads/1/3/4/8/134874272/zazusetaragexuzura.pdfIn PDF document text
    • https://volorizog.weebly.com/uploads/1/3/1/0/131070051/7462721.pdfIn PDF document text
    • https://zorikibezoxima.weebly.com/uploads/1/3/1/3/131384208/nujadibidemifeb.pdfIn PDF document text
    • https://laludigulasi.weebly.com/uploads/1/3/1/4/131437637/1496979.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444864/normal_5feb6b90ef993.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409801/normal_5fde7363f38e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425230/normal_600d37e26f97a.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
    • http://wowadepadon.rf.gd/90027619488.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/513c172f-a883-4bce-b22c-b8a2b8589b87/vetogiruketadivobarodigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78fd2a19-bc44-463f-843e-30f9ea452b41/xukurutosuwokovox.pdfIn PDF document text
    • http://nufejubonuviwo.epizy.com/1770610920.pdfIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_a433f0494fff4df08ba9a2265a1d8c7c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e91a1ef-1ab9-46ed-ad55-22217662e2d2/tasofotesa.pdfIn PDF document text
    • https://4fbc56e1-d9a2-4996-be1d-38f9cd263936.filesusr.com/ugd/b1afee_0b4279fd8fa74985bc1fc627a5085b28.pdf?index=trueIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_4c1c14c7f4a544d4a8a44d6e9d4fc7f9.pdf?index=trueIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_4f5d8110705d439284aa5b2d13928d66.pdf?index=trueIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_ba3ef77640014c9eb8387b6f954a561d.pdf?index=trueIn PDF document text
    • http://povaxuvibilab.epizy.com/73020663799.pdfIn PDF document text
    • http://gonuwufif.epizy.com/fairy_tail_anime_episodes_guide.pdfIn PDF document text
    • http://sivisalatifaba.rf.gd/mac_os_list_all_processes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56962e49-6693-4589-b532-95b08fab269a/radev.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_off0000e868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 4700 bytes
SHA-256: f07e6fa2a7cc8d969a2b376d04a22651d9f645a7fcc3c8bde626997ba6c971ca
font_01_sfnt_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 10748 bytes
SHA-256: f9ea4830d200ee51ec82d65b6d85602348905d0f89b2dcb47366b49a211d1923
font_02_sfnt_off00011d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D28 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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