Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8674326a4bacbe…

MALICIOUS

PDF

75.8 KB Created: 2021-04-16 09:40:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5459ecb8ec1af02f427df6905e979ee4 SHA-1: 289156dd38c0230a3a0c153811266659e5cb98ae SHA-256: 1c8674326a4bacbea542c582ef0151b4494b0aed13af150b7c8fc9233e97adb4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to benign content, suggesting a link farm or SEO poisoning tactic. However, one prominent URL, 'https://jumiwimov.ru/strik?utm_term=database+administrator+job+description+and+salary+in+india', is flagged as unknown and is likely the primary lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=database+administrator+job+description+and+salary+in+india
    • http://opit.space/59955660128zw521.pdf
    • https://cdn.sqhk.co/pujimuxuja/5idLwij/jiniwaxenazarez.pdf
    • https://todumubisopid.weebly.com/uploads/1/3/5/3/135312552/3951092.pdf
    • https://cdn.sqhk.co/sunomedude/mjehaSY/hocus_pocus_cast_then_and_now_2020.pdf
    • https://bazugibeb.weebly.com/uploads/1/3/1/4/131453150/533442.pdf
    • https://cdn.sqhk.co/mutuwatu/ibjjsSH/carrier_services_group_champion_ohio.pdf
    • http://bezprovodov.guru/veladazexakepilalag50mhs.pdf
    • https://lefawiput.weebly.com/uploads/1/3/5/3/135324435/28b3267754a399.pdf
    • https://cdn.sqhk.co/kivipemo/CBzRJjj/4831920716.pdf
    • https://xabodalemebom.weebly.com/uploads/1/3/1/3/131381489/seduj.pdf
    • https://fotiterik.weebly.com/uploads/1/3/5/3/135328456/tofapupi_kadolopisinuzom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vutame/2006_chevy_equinox_fan_motor_problems.pdf
    • https://s3.amazonaws.com/sizabo/fivimejawulunim.pdf
    • https://s3.amazonaws.com/kefodek/82412041785.pdf
    • https://s3.amazonaws.com/fajixe/flat_belly_diet_4_day_jumpstart_meal_plan.pdf
    • https://s3.amazonaws.com/sifawekujiki/fitbit_charge_2_manual_p_svenska.pdf
    • https://s3.amazonaws.com/mevuzokekenojab/negilogiferefafopi.pdf
    • https://s3.amazonaws.com/pafiganovavi/cardiff_tourist_map.pdf
    • https://s3.amazonaws.com/jotizifime/adventure_of_the_empty_house_sherlock_holmes_summary.pdf
    • https://s3.amazonaws.com/fulosobezur/how_to_calculate_geometric_average_return_in_excel.pdf
    • https://s3.amazonaws.com/jinabom/can_you_use_printable_vinyl_on_mugs.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec1e.bin
9ec71e3a06d4e8ab286ed3979862e1cff9b1d2714d77f1f95ce3235a8c074607		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 5536 bytes
font_01_sfnt_off0000fee4.bin
ffc376ec12d12be4888ad9036f231b1f0d00c379f8e2dc3bf052249542a183fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE4 10096 bytes

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