Malicious PDF — malware analysis report

Static analysis result for SHA-256 2223faafa5d3c13f…

MALICIOUS

PDF

85.3 KB Created: 2021-03-22 05:01:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 579c2baca82ddd4ec5f021c11d70db8c SHA-1: d9014bc9f41984945133ef5e0898b44a8cfba8d2 SHA-256: 2223faafa5d3c13f04f4cccb660403b767737db86a438d80710bc2e80207d807
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 link farm, with the primary URL pointing to a suspicious domain. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=mobogenie++for+pc+windows+xp
    • http://jobipelulimobo.iblogger.org/compound_adjectives_worksheet_grade_4.pdf
    • https://nonedavoxezi.weebly.com/uploads/1/3/5/9/135956696/niduroduk_feporavu_nunewute_firexeluzisidem.pdf
    • https://gisijenoxumo.weebly.com/uploads/1/3/1/4/131437849/aca81b3d1ab2453.pdf
    • http://zavodtriumf.com/mabomunoruruponozovonzvfj5.pdf
    • https://xidiziwuzubiwon.weebly.com/uploads/1/3/4/6/134653180/sagoto-novobeso-nawegalaruzowi.pdf
    • http://mishabelle.ru/nc_drivers_license_number_formatiwdf5.pdf
    • http://guzofegarakad.iblogger.org/apprendre_l_anglais_plus_rapidement.pdf
    • http://obschee.xyz/saluxovomopevabpzvu8.pdf
    • http://xuwajofona.iblogger.org/indigo_airlines_baggage_information.pdf
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/8214e3bcb01.pdf
    • http://maewallace.com/the_healing_secrets_of_the_ages98pgo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/dubiditiginowo/infinix_note_7_6_128_price_in_india_flipkart.pdf
    • https://s3.amazonaws.com/xalexojaxipud/75499915879.pdf
    • https://s3.amazonaws.com/levumoduf/best_anime_apps_for_android_reddit.pdf
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_7eb4afefef9a402184d1d291f0151f65.pdf?index=true
    • https://s3.amazonaws.com/pubopelej/treatment_of_nephrogenic_diabetes_insipidus_guidelines.pdf
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_44a2c218257b4110840f6347b902278d.pdf?index=true
    • https://s3.amazonaws.com/kagedatabujo/vovoposamimagedidefisoku.pdf
    • http://nujexaraxeb.epizy.com/washington_state_basketball_schedule.pdf
    • https://s3.amazonaws.com/vikukinumet/55480762724.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe49.bin
d8e14dfdac9670e726bb5b1266470e431f7528b42bd134ebecafbea101d164f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE49 5092 bytes
font_01_sfnt_off00010fb6.bin
2d35c81b12a2473d93db36bf37b78b1728f1462fece5854edddcedf4741889a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 15736 bytes
font_02_sfnt_off000139ef.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139EF 4324 bytes

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