Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37c44bdbc6d4311…

MALICIOUS

PDF

78.5 KB Created: 2021-03-29 18:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e441dd04373e08dd99457891f16bf104 SHA-1: 5986d944ef38177920ec7a9b9a631be98cf394cc SHA-256: f37c44bdbc6d43116d2b151337b30e441e9076ddc50f48b7cb6030ae4a7ee03f
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 0.9994

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://lozipotod.ru/strik?utm_term=short+term+commercial+paper+etf PDF link annotation
    • http://xiredanu.22web.org/vision_ias_ancient_history_printed_notes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_6055451b59dd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491412/normal_605dc5fcf3e30.pdfIn PDF document text
    • http://bostpolamos.site/40480608364e64ha.pdfIn PDF document text
    • http://comp-arenda.site/gimokobovutupsjiu6.pdfIn PDF document text
    • http://pagebake.com/asus_tinker_board_android_8v66jf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421209/normal_5fd77e0714e2c.pdfIn PDF document text
    • http://xozonline.ru/soresetilevumonarofe0ea3t.pdfIn PDF document text
    • http://halfraire.xyz/bond_sweater_machine_instructions6szsz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b0837e58-6fb0-4b2c-a83d-c451c4d85cc2.filesusr.com/ugd/1169b1_3c12f709251a41978d704ead8b149b6b.pdf?index=trueIn PDF document text
    • http://kegotetebam.epizy.com/gitedegivikakorakareg.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/munkres_topology_solutions_chapter_3_section_26.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/bexavakizobuxa.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/linetotenojiwiselulewixa.pdfIn PDF document text
    • http://podepabat.rf.gd/gate_academy_electrical_engineering_books.pdfIn PDF document text
    • http://pejasevolebik.rf.gd/soxelotowugopoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/dezukipasabugeg.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/jacoco_report-_aggregate_example_gradle.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/83317736317.pdfIn PDF document text
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_f2eb0a41829045d2876f90ff2c1b6391.pdf?index=trueIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_d43c58a3d1314b67a02949d8f8c1b577.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tomaxade/preformed_elastomeric_joint_seal.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/xexaxotodogewe.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_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 5180 bytes
SHA-256: 67a1f9967fd078d1d2260592c33664677d832ea9e1f256fc2896307141f0c116
font_01_sfnt_off000106c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 11152 bytes
SHA-256: 2a39431122813c19ef39d49c25c6ff3df129a3a546ceffd530be1387f2021f26

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