Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9a2eba21584d34…

MALICIOUS

PDF

68.0 KB Created: 2021-04-18 04:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a02091f497060365277d2e4a4974d3cf SHA-1: 7627a8b42cdbea3cd558d0d1127309dc149f0903 SHA-256: 5f9a2eba21584d34ead1541f3c20a3b87596f036502321cd2c236b6a0d6af2ba
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to direct users to potentially harmful websites. The primary malicious URL identified is https://soxebez.ru/strik. While no scripts were extracted, the structure and link farm behavior are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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://soxebez.ru/strik?utm_term=d%2527link+2750b+repeater+mode
    • https://lubexunomug.weebly.com/uploads/1/3/2/6/132696146/bazeverabemif.pdf
    • http://jesiwufap.iblogger.org/50826385932.pdf
    • http://pejokepi.mywebcommunity.org/47651583764.pdf
    • http://mirunex.iblogger.org/meveburazoralew.pdf
    • https://xutafutixon.weebly.com/uploads/1/3/4/5/134576274/37c2545a.pdf
    • http://zoluwofemofuper.sportsontheweb.net/90359710411.pdf
    • http://voxofixixaj.iblogger.org/rerafapu.pdf
    • https://faturigazed.weebly.com/uploads/1/3/4/8/134859690/nawipitebil-vozenutegi-soguluxet.pdf
    • https://dudidupu.weebly.com/uploads/1/3/1/3/131380390/makafim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tixedujegibex/basler_be1-_25_relay_manual.pdf
    • http://wojibikifi.myartsonline.com/catalogo_mary_kay_mayo_junio_2020.pdf
    • https://uploads.strikinglycdn.com/files/b53909e6-4bde-42f0-8817-2d3b46aeec74/big_green_egg_table_plans.pdf
    • https://uploads.strikinglycdn.com/files/0073f5e8-d80c-4ef4-8973-486f46410fc2/hillsborough_county_schools_closed_eta.pdf
    • https://uploads.strikinglycdn.com/files/ae7d9279-4a37-45e6-936a-fb79ead3af22/jebux.pdf
    • http://kubowulurarekij.myartsonline.com/vifesirow.pdf
    • https://uploads.strikinglycdn.com/files/d28f1b80-9876-4028-aece-491e36266c6c/9616760891.pdf
    • https://s3.amazonaws.com/lomogas/10392860832.pdf
    • https://s3.amazonaws.com/likerajatob/how_long_to_cook_6_cups_of_rice.pdf
    • https://s3.amazonaws.com/wexoteluwag/telufevavegametudawewo.pdf
    • https://s3.amazonaws.com/vuxalirudidel/gcse_further_maths_textbook.pdf
    • https://s3.amazonaws.com/xovekolamoxe/acellus_answers_geometry.pdf
    • https://uploads.strikinglycdn.com/files/5ebb58ff-556d-4d65-bcea-05b1104baadd/43391022299.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_off0000cf39.bin
98ec0339b1bfbc508c7617ed14f0721fe961a54bd0b18777b60acde41777c419		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF39 5640 bytes
font_01_sfnt_off0000e25d.bin
fedaa17c2ac791de5caf665fef6cbaea4b04b8b76143e69489cc6cfa03bd3590		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE25D 9484 bytes

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