Malicious PDF — malware analysis report

Static analysis result for SHA-256 268b795b5353f24f…

MALICIOUS

PDF

81.4 KB Created: 2021-03-15 05:15:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c40d0ad57588ddd93265763306c36919 SHA-1: b0e26ea327f1608e3b44b8af817d1a4e6824b491 SHA-256: 268b795b5353f24ffc110088c1b92755cb6f68685070f359d7f90ade250bb2ce
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable domains and redirector infrastructure, indicating a link farm designed to distribute malicious content or phish users. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/award?keyword=noida+building+bye+laws+2020+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391920/normal_5fd17c774e213.pdfIn PDF document text
    • http://fobativ.mywebcommunity.org/titase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420260/normal_6040f4aa408f1.pdfIn PDF document text
    • https://nekegofoka.weebly.com/uploads/1/3/4/3/134364724/8896130.pdfIn PDF document text
    • https://cdn.sqhk.co/biloriput/8iiggpc/42422888866.pdfIn PDF document text
    • https://kanazotevixif.weebly.com/uploads/1/3/2/7/132740718/famujip_wezix_jajolupikefowa.pdfIn PDF document text
    • https://lubefapezixa.weebly.com/uploads/1/3/1/3/131398117/5737294.pdfIn PDF document text
    • https://siwinapevaz.weebly.com/uploads/1/3/4/3/134338690/3361004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379379/normal_601f5a935b934.pdfIn PDF document text
    • https://sawotulexude.weebly.com/uploads/1/3/5/2/135298589/noxixun.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/qpgfpuH/mountain_ninja_dashboard.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gumizaxewa.atwebpages.com/washington_state_university_basketball_coach.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/steel_column_design_example_as_per_is_800.pdfIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_1a9bc6b73666442bb80526c01c209ddc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/teamspeak_3_free_android_apk.pdfIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_d5da3ce4fd774904ba508d427cf22a4c.pdf?index=trueIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_c083b0b605b043fb8167720ca3cfa23c.pdf?index=trueIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_d20764f0154c468abca4f12bca5c8be8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/drawing_simple_electrical_circuits_worksheet.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_off0000ffcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCC 5692 bytes
SHA-256: f4be7d541d48bddae5d6515c92c20456a1eb658611d3c58c8ec36f1d16a4351f
font_01_sfnt_off0001135b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135B 10912 bytes
SHA-256: ce8570874b363bc486040a520172953c2e741cb60d35b1e31c6baea121400368