Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc44a09af98ad28…

MALICIOUS

PDF

74.5 KB Created: 2021-03-23 22:16:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffb7d6bd9c5ae6693c70748e9b71ee81 SHA-1: 0067c79f838c65ca6c130d4f8d86a4b324bea09c SHA-256: 5dc44a09af98ad287cfbc13e20b7ac3f111ec1f6a6eec012474c463284134b08
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, with one prominent URL pointing to 'lozipotod.ru', suggesting a phishing or malware distribution attempt. The 'SE_CLICKFIX' heuristic indicates the document likely instructs the user to execute a command, a common social engineering tactic to bypass security measures. ClamAV detection and ML classification further support its malicious nature, likely as a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://lozipotod.ru/123?utm_term=run+battery+report+surface+pro+3
    • https://kuvinonufero.weebly.com/uploads/1/3/4/3/134307364/2099417.pdf
    • http://supusatode.sportsontheweb.net/hernia_inguinal_2020.pdf
    • http://vegofejolafud.mygamesonline.org/93112384627.pdf
    • http://kosamaritaj.getenjoyment.net/how_much_is_a_tune_up_usually_cost.pdf
    • https://kavuxidawikux.weebly.com/uploads/1/3/4/0/134000359/wepunuvidedimutake.pdf
    • https://generixa.weebly.com/uploads/1/3/5/3/135350481/6135897.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jenisozazewubo/free_niv_bible_for_android_offline.pdf
    • https://s3.amazonaws.com/varoximu/interview_answer_what_is_your_biggest_weakness.pdf
    • https://uploads.strikinglycdn.com/files/766d7f34-4a60-4096-88ce-2cb4d811e727/gidedovanazorubonisam.pdf
    • https://s3.amazonaws.com/moduluzuxikari/office_2016_64_bit_for_mac.pdf
    • https://s3.amazonaws.com/bugutaj/vat_audit_report_format_excel_gujarat.pdf
    • http://feferabi.atwebpages.com/82518935479.pdf
    • https://uploads.strikinglycdn.com/files/8f505e7d-5e13-483b-a9f3-7427a9016bbd/how_do_i_program_my_directv_remote_to_rf.pdf
    • https://s3.amazonaws.com/gidibesuxi/bergeys_chevrolet_used_cars.pdf
    • https://s3.amazonaws.com/kozewuposoridil/bajigufuporafaxejofelo.pdf
    • https://s3.amazonaws.com/mukut/gopesamazimivad.pdf
    • https://s3.amazonaws.com/banula/6413874600.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_off0000e55f.bin
7ce848d5aa80dcfc02f1a2bd0bf761e04c4345ae1d92f855526f64504ee5e76c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE55F 5388 bytes
font_01_sfnt_off0000f7d1.bin
84c502808945699c8e1786b4242c8f9640b02996941301fa3e924077bf87f1a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 10996 bytes

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