Malicious PDF — malware analysis report

Static analysis result for SHA-256 e520168c069dc9c9…

MALICIOUS

PDF

78.9 KB Created: 2021-04-18 10:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3a682eb98805662959130a56d84a9934 SHA-1: baf8bae43a32a79a115adc77ea24ad34de397094 SHA-256: e520168c069dc9c9823ff109646d1a27f8ae30b827dbc29f45346a09b3e722fe
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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
  • 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://vilenefex.ru/strik?utm_term=porque+se+siente+seca+la+lengua PDF link annotation
    • https://jazitilifa.weebly.com/uploads/1/3/1/4/131414561/8131930.pdfIn PDF document text
    • https://wojazaxu.weebly.com/uploads/1/3/4/5/134589930/7365211fd.pdfIn PDF document text
    • https://mutevoleronuxo.weebly.com/uploads/1/3/5/3/135351112/nibopeka.pdfIn PDF document text
    • https://xokebewogaxuwu.weebly.com/uploads/1/3/4/5/134588239/fesorovudopefe_forigim_bepipujojoli.pdfIn PDF document text
    • https://dijajogid.weebly.com/uploads/1/3/0/8/130874349/962e8dab1d248.pdfIn PDF document text
    • https://cdn.sqhk.co/tikalamin/1hihhoE/earth_live_wallpaper.pdfIn PDF document text
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/daluzuxodew.pdfIn PDF document text
    • https://jodutofafedabaf.weebly.com/uploads/1/3/1/4/131452959/a607e3b8b1d8f.pdfIn PDF document text
    • https://dudasajaje.weebly.com/uploads/1/3/4/3/134362454/6d66587ecd.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/Jpgfkgd/sample_discussion_lab_report_psychology.pdfIn PDF document text
    • https://bosuzegenelulu.weebly.com/uploads/1/3/4/1/134131522/7f58d7139.pdfIn PDF document text
    • https://ruvavaru.weebly.com/uploads/1/3/0/8/130874457/basoviwuwuvafusib.pdfIn PDF document text
    • https://pimidunobesuxig.weebly.com/uploads/1/3/0/9/130970022/3f299b.pdfIn PDF document text
    • https://cdn.sqhk.co/guzowozuk/agcig8C/woxixifigeb.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/soezCii/8547741717.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
    • https://uploads.strikinglycdn.com/files/2abbca69-e3cc-4265-b11d-e19b6df39163/jozunupaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06c0df52-d53a-49ea-bca9-ee2009562baa/difavewavibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5bcf534-59de-4c51-9d1b-87485c3590ef/group_theory_in_discrete_mathematics_geeksforgeeks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f7e4ac5-9d46-4be0-9765-7c43193edfdb/69277161740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8f8e0a8-97bc-47aa-af26-cc3a5dee8cbb/nc_drivers_license_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ca74298-e3fd-40aa-a2f4-d3a5bb799dce/camp_x_ray_full_movie_download_in_hindi_worldfree4u.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6109fdb-90e9-4249-80c3-1ac8c9d9eff2/mekufilanefopenazuvuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de1768f5-b9aa-47e2-aadd-96d9e2f15e6b/2019_tesla_model_3_long_range_mileage.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_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 4976 bytes
SHA-256: 8fb5583313afc7e13b9ce8822e648ca34880c4dbec1976ff49242b8ed538048b
font_01_sfnt_off0000f8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AA 12200 bytes
SHA-256: 617d203545c3adabb08dd7334f99204b4f262c5ec9214d170b853fab6656e71b
font_02_sfnt_off00011ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF2 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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