Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e04bdca95b92c2…

MALICIOUS

PDF

74.9 KB Created: 2021-03-25 18:41:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 10ff909af6047aee2613c1a132481dcf SHA-1: c5844f9eecc5b652c92bf3003b3db15528c03f21 SHA-256: 25e04bdca95b92c2567c40f88fe9fc28e28abb755afbd46e2ca6182b7c0f81d5
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating malicious intent. The presence of numerous external links, one of which points to a suspicious URL (https://pelibifir.ru/wix?keyword=paperbacks+from+hell+pdf), suggests a phishing or SEO spam campaign. ClamAV also detected it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • 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://pelibifir.ru/wix?keyword=paperbacks+from+hell+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451205/normal_60228c9dee1ad.pdfIn PDF document text
    • https://wovenatoz.weebly.com/uploads/1/3/1/4/131454427/7074753.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367281/normal_6007aaec8d7cb.pdfIn PDF document text
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/kewuke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415334/normal_605b909a515f5.pdfIn PDF document text
    • https://rominovomi.weebly.com/uploads/1/3/4/0/134041030/xikugebasufo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/jack_reacher_amazon_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/indesign_free_template_invitation.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/performance_des_footballeur_camerounais_en_france.pdfIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_f613db6f4c0a41a0b829b734d8526d5f.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_943455cd665a4162a5e82ce009126070.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gopifu/how_to_get_maximum_heat_from_a_wood_burning_stove.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/mens_blazer_style_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/worksheet_on_weather_and_season_for_grade_3.pdfIn PDF document text
    • https://82a15d5c-09b3-4b2c-b6d5-cdf01964cb25.filesusr.com/ugd/5adcb9_0730af7fb11a4506ad218546ebef8c6c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bogijexu/carrier_infinity_zone_thermostat_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/difference_between_appium_and_android_studio.pdfIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_403c29e8845944e5a6ee9ab690d31c03.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_off0000e608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE608 5600 bytes
SHA-256: 851d53115c5e06357274ec45462cf0d7bbb1de50c0a64c2d39a11b955d5ba7fa
font_01_sfnt_off0000f8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 11284 bytes
SHA-256: ebaf4a2cd963c0508fcb5184c91cc913bde524ec1edd100fea67237d1d4ba39c

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