Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c667b997155249b…

MALICIOUS

PDF

102.7 KB Created: 2021-04-19 00:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 634d7b12d1649d791231b5ccda72d9c8 SHA-1: 3f0ce90b7a68e500f9dc2345b39324fda6992d68 SHA-256: 7c667b997155249bb55ebe003538e452fcee692f1dff4b49d32e22573d5b306d
186 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pelibifir.ru/strik?utm_term=how+many+cases+of+coronavirus+are+in+wood+county+wv PDF link annotation
    • https://xixasoxi.weebly.com/uploads/1/3/5/3/135324484/4196061.pdfIn PDF document text
    • http://lestyprin.online/vuderugoyb9pt.pdfIn PDF document text
    • http://xaxifibipebux.iblogger.org/78083988085.pdfIn PDF document text
    • https://suguvojonejufo.weebly.com/uploads/1/3/4/5/134585364/db1be6ce.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/fegexafirirade4q9kf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/98872ae9-ed0d-4b4f-b7ea-7c8d042c08dc/north_carolina_drivers_ed_handbook.pdfIn PDF document text
    • http://rofamotitasijud.rf.gd/grammaire_en_franais_apprendre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8362de04-13bc-4ef1-9442-b89f247c9bbb/knight_of_the_seven_kingdoms_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b14189df-4db9-4730-816b-dbe10f3ef76b/bivivafotekefirariwog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c8ef405-fd2e-4f5d-90a1-e8eb75cea323/how_to_set_time_on_rca_usb_charging_clock_radio.pdfIn PDF document text
    • http://jobifizokugo.rf.gd/esc_guidelines_revascularization_2018_ppt.pdfIn PDF document text
    • http://datufubizut.rf.gd/chaotic_neutral_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/bakuvenavobidopetejivu.pdfIn PDF document text
    • http://lobidirubegevil.epizy.com/bizokexotutopenisanedure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddfcfa5f-b70a-4bc9-945a-88054d051cb2/the_seven_sins_of_memory_how_the_mind_forgets_and_remembers.pdfIn PDF document text
    • http://jojudodadanu.epizy.com/minority_report_2002_imdb.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/vepubewufoduvinas.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/54755136954.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_off000152bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152BF 5352 bytes
SHA-256: 3bc46b0bb033998b81927c276500bf813e243906da49248ef5e6bf910d3bffc1
font_01_sfnt_off000164f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164F4 11984 bytes
SHA-256: 4c273ec0f5fdb5137dd8be440ba97ea14ac1496041d5d1fc2b80f41a40f9b9f5

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