Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7814c99ee9002a6…

MALICIOUS

PDF

74.3 KB Created: 2021-05-06 10:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 786e77792e64eb3f964420658a7f85aa SHA-1: 2685e93d3ba924b131024cb205f1ea6b7e586f19 SHA-256: c7814c99ee9002a673fba05b86cc28ee12a5d4c9d90c04119a17fac3e5d94ecc
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the presence of numerous external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crophysi.ru/strik?utm_term=how+to+cook+steak+on+the+lean+mean+grilling+machine In PDF document text
    • https://cdn.sqhk.co/jojojidatun/0iggehg/ipl_live_cricket_match_app_free.pdfIn PDF document text
    • https://pesuwoleze.weebly.com/uploads/1/3/5/2/135295903/b861d140d.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosobupis/HhiicC5/coloured_bumper_plates_uk.pdfIn PDF document text
    • https://tidosivapozagul.weebly.com/uploads/1/3/4/3/134390518/3b6ac1a6e8.pdfIn PDF document text
    • https://cdn.sqhk.co/suwefememe/hcN5ig8/smartsheet_gap_analysis_template.pdfIn PDF document text
    • https://wubajepetodol.weebly.com/uploads/1/3/1/6/131606368/f46768e6f8635ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425237/normal_603676b01b462.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/hc3Omji/sufiniwarinatedem.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/KibhiyI/smash_flash_2_modpack.pdfIn PDF document text
    • https://nodigikoj.weebly.com/uploads/1/3/4/3/134384892/9cbe10f54cbd.pdfIn PDF document text
    • https://fejuzewe.weebly.com/uploads/1/3/4/8/134883228/dabedasuriv-naxinas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474999/normal_600d79013c09c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445324/normal_5fffbfd2c604d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_347cae5f37ee4968a558ff2b55a8aab6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/ganufebubupujunelunokokuw.pdfIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_79f48105211646c6afaf204c01acfd57.pdf?index=trueIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_e11f5a7716b847f69c57f6e5b1ec22fb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pezofut/11531457998.pdfIn PDF document text
    • https://badbb018-ab4e-499b-b788-960949b82e3d.filesusr.com/ugd/4f4c56_e9d263df32574286a97ce7c381a82354.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/nenixaxakarabapawitozit.pdfIn PDF document text
    • https://c2245d91-bd3f-4016-bed3-1da34bcfd793.filesusr.com/ugd/9a652e_ed35a3beac9345c88ab9100b05a94fba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/natewared/composing_and_decomposing_numbers_grade_1_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/anacreonte_poemas.pdfIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_2141371cc77b4c5aab6b8233c4a34425.pdf?index=trueIn 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_off0000e3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 5332 bytes
SHA-256: c6373d6ee6b38e7f1d0243ac888bba18c8e98d76d539d3ac02eba5b6c2bbc758
font_01_sfnt_off0000f5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 11184 bytes
SHA-256: ff7b132f00162944bb595ce5fb8c6c31d592b05455c55736a8c743c4e2cb6c18

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