Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f5d3860f8c3327…

MALICIOUS

PDF

95.5 KB Created: 2021-03-19 21:18:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c0c1ab7ddbd84c4d47f3ee8a4a62d36b SHA-1: 162eece2b04586f464909b6a257865d56e754bf4 SHA-256: a4f5d3860f8c3327987531f196b811f60a3d5df21361240a47b7332b9e260a4b
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 0.9998

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://vilenefex.ru/strik?utm_term=pulgadas+a+milimetros+tuberia PDF link annotation
    • https://dupevolorimix.weebly.com/uploads/1/3/4/5/134588768/dosijajitu-nedox.pdfIn PDF document text
    • https://lekaretuzej.weebly.com/uploads/1/3/0/7/130738752/sarekiwujuzozo_jowositawudenep.pdfIn PDF document text
    • http://bijopesenof.iblogger.org/gusebozirobekewoze.pdfIn PDF document text
    • https://lepefolavexar.weebly.com/uploads/1/3/0/8/130874674/27e96.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/9901566.pdfIn PDF document text
    • https://bilunoxenaxu.weebly.com/uploads/1/3/4/4/134474733/lemolopug-zivofojekikew-junubixurako.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://katevafitaga.epizy.com/loteg.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/lifelefubodopudukaxorimiw.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/how_to_use_texas_instruments_ti-30xs_multiview_scientific_calculator.pdfIn PDF document text
    • http://waraxiv.rf.gd/cvc_words_worksheets_for_adults.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89b79d33-f127-4ba0-b21b-5485d9bcaa7b/baby_bjorn_bouncer_bliss_anthracite_cotton.pdfIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_a9437137ad0746d998979e01ffb3bb94.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/last_of_the_mohicans_cast_1957.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/lunenburg_county_court_report.pdfIn PDF document text
    • https://1a899ca6-11bf-4464-971e-4bf0b885e765.filesusr.com/ugd/4ac3ff_951dc3a648694301a6d2eef722842027.pdf?index=trueIn PDF document text
    • http://tegegizupe.rf.gd/interpretacion_clinica_de_la_biometria_hematica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a63a7dfa-4ca2-4ef8-a491-1a319a5594b5/ocarina_of_time_3ds_citra_cheats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b06bd640-aa47-4d7f-a6a8-30567a82e48e/gebabevubotozizenet.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/bionaire_steam_mop_owners_manual.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A3 5288 bytes
SHA-256: 866045166db856c8422d21469085103e32da7b0267b1d03b998d44c1669af50c
font_01_sfnt_off00014781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14781 12104 bytes
SHA-256: fa4e815e4ad669daa283e75ed4455290c27d103f3c7b5b1d3b220fb4bec9a0d3

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