Malicious PDF — malware analysis report

Static analysis result for SHA-256 977bdf04174293ac…

MALICIOUS

PDF

60.4 KB Created: 2020-11-17 20:23:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d281eed9892879a55645a3baa76599b7 SHA-1: ddc54e7e62e14d396bb2baf4b586332a23d5a051 SHA-256: 977bdf04174293acfc9c83692f521ef7111b587d1cfbc6ce1b2a0c51a1552a7f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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://trafffi.ru/strik?utm_term=yamaha+fz6r+owners+manual+pdf PDF link annotation
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/xenonosopugaxos_sanexi_wadiralawuxid_wajejulosesopus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387703/normal_5f9df5b9c0abb.pdfIn PDF document text
    • https://kerizivol.weebly.com/uploads/1/3/4/6/134665291/pirovafu.pdfIn PDF document text
    • https://jedarixires.weebly.com/uploads/1/3/0/9/130969076/276494.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/xijirumajebu_winoxadisazutem_liverosa_torukad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413240/normal_5f95a405ebc8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5fa5d2bd60dec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458633/normal_5fa7bf1f0eb38.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/dalava/23909911311.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/daltons_playhouse_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8de9592-ad81-477f-bb76-099a8ce2e9a0/62163720716.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/vufer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/678c7198-e818-4c39-ab3d-3203522e4b5a/rawazapugemul.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/ap_chemistry_summer_packet_answers.pdfIn 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_off0000b1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EB 5540 bytes
SHA-256: d32b3da6f001edf48a51409b8b0e058e55d7cb29ec58199454a6f04ad89d652b
font_01_sfnt_off0000c4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AF 9504 bytes
SHA-256: 6689f73c4cf98c73bae0d7cdf09c7b4840da1f36ac09c8d6f15bd5d89e773f2d

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