Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a7ae6e9e4cf9b1…

MALICIOUS

PDF

73.7 KB Created: 2021-03-29 11:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f36966a82c9679d6595ed0c6ccb01c77 SHA-1: 107c41f1288e150fd57489fe3703c3309201bac4 SHA-256: 10a7ae6e9e4cf9b111d6e2df2bb4e8152205f9873ffc7a224cd003c9a3553e45
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded external links, with one pointing to 'kuzutuzo.ru', suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, mentions 'Winco generator parts manual', likely a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/wix?keyword=winco+generator+parts+manual
    • https://baxujemig.weebly.com/uploads/1/3/4/5/134593920/8638b.pdf
    • https://cdn.sqhk.co/sisadenev/PvgjsK3/collage_maker_mac_free_download.pdf
    • https://cdn.sqhk.co/latosagax/iihehdS/crusaders_quest_best_heroes_2020.pdf
    • https://sawolopu.weebly.com/uploads/1/3/6/0/136049845/wudenezam_losojajakumesev.pdf
    • https://ninapivojejuru.weebly.com/uploads/1/3/0/7/130775346/9386299.pdf
    • https://kutubugovu.weebly.com/uploads/1/3/4/5/134581815/04454f.pdf
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/85efcead24c.pdf
    • https://buzokiki.weebly.com/uploads/1/3/4/8/134853803/127216.pdf
    • https://cdn.sqhk.co/xexisini/ibWiaI9/93254474152.pdf
    • https://tuxibefogeja.weebly.com/uploads/1/3/4/3/134359070/rudunimesa_korejodujazaxe_gevopaduj_ronot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zozofufulolig/jaruma.pdf
    • https://uploads.strikinglycdn.com/files/dd76f4dc-4754-4a42-ba28-93d1894f3b82/68919182164.pdf
    • https://uploads.strikinglycdn.com/files/3817ba24-1450-47dc-889e-3d92d6f02ec2/how_much_do_trampolines_cost.pdf
    • https://s3.amazonaws.com/zidenigad/basic_subject_verb_agreement_rules.pdf
    • https://s3.amazonaws.com/kofabube/tudax.pdf
    • https://s3.amazonaws.com/zonebon/android_tv_file_manager.pdf
    • https://s3.amazonaws.com/jagux/sherlock_holmes_novel_summary.pdf
    • https://s3.amazonaws.com/zurovajij/1978_honda_express_value.pdf
    • https://s3.amazonaws.com/jusuberu/34675380455.pdf
    • https://s3.amazonaws.com/gonima/89874912348.pdf
    • https://s3.amazonaws.com/nitizobuv/astm_a530_free.pdf
    • https://s3.amazonaws.com/feliso/h_pylori_treatment_guidelines_pediatric.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_off0000e158.bin
f8aa0568b96f392b28c79eb615a312d8245773733664dbc7b4c822777b433011		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 5268 bytes
font_01_sfnt_off0000f33e.bin
0b24ca3c292c7825726385814391ca5b5bb607586b2ee8d1d07f96e9e16c69c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 11232 bytes

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