Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc53e71b25d55f7…

MALICIOUS

PDF

77.1 KB Created: 2021-04-21 06:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9588c67b449f8b48238ce5681b68cb8a SHA-1: 5b0b89d55feb37dd915ac6892b7c03c48aaa5a5a SHA-256: ccc53e71b25d55f7ab84af76b4bfad11f720c9da86e6eff32b44de4d3e78d2f6
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=dive+into+python+pdf+download PDF link annotation
    • http://pestore.pro/xuxonefioueap.pdfIn PDF document text
    • https://cdn.sqhk.co/jemedolena/hb01gg6/tanurev.pdfIn PDF document text
    • http://blubadgehelp.net/xufovewejuxiwowujapedu2e22q.pdfIn PDF document text
    • http://cuzinfo.ru/lucky_looter_mod_apk_android_15sct0.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/chfEUia/rust_bucket_3_ben_10.pdfIn PDF document text
    • http://organic100.fun/kesuxitiparaj1f10u.pdfIn PDF document text
    • http://arfesopt.com/29859303913n1ro9.pdfIn PDF document text
    • http://blockhcain.host/rarimatibiji01jhc.pdfIn PDF document text
    • http://instahelpforbusiness.com/how_to_clean_a_mr_coffee_4_cup_coffee_makerk4bt5.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/iaROaha/najedugibewakotabiduten.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_11e2712495934af0b91d8d3a79129847.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/lawuwekuseputosawituze.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/51266040155.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/what_are_the_4_stressors_on_social_media.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/cara_bandicam_full_version_gratis.pdfIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_1f0a9ffdbabd4566b9dfcdab894c0663.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/40251784586.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/vpn_free_for_pc_extension.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/mossberg_500_serial_number_l.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/cours_anatomie_de_l_oeil.pdfIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_e591b5726a094a64a72156c7980bacc4.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_off0000ec16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 5108 bytes
SHA-256: 783620077b4684f22b7c6da522681a3807e82482344eb0993f353d5da7e7c69a
font_01_sfnt_off0000fda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA0 11984 bytes
SHA-256: 115775b9c11fa333301eabd93b74a911025bb316821806cf2e54b2a867a43ecd

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