Malicious PDF — malware analysis report

Static analysis result for SHA-256 a730e14daef1f78f…

MALICIOUS

PDF

73.3 KB Created: 2021-03-09 18:35:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 338a7d46c8cddaf183d6cb29afb63e12 SHA-1: c1aa32d3afd3b1a32153e01674d96241fd051c58 SHA-256: a730e14daef1f78fa383ece4fb1eb111b20004f1ddffa01739938730d5bbc19d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics point towards a spearphishing attachment as the likely attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://zajinet.ru/award?keyword=computer+error+beep+codes+pdf PDF link annotation
    • https://cdn.sqhk.co/wusezofetib/eiejaid/2580705452.pdfIn PDF document text
    • http://ekzo-fruit.ru/21551351727eq2pe.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/1704920.pdfIn PDF document text
    • http://marifivelaj.mygamesonline.org/7209417911.pdfIn PDF document text
    • http://thesalle.xyz/how_much_do_interior_designers_make_in_floridajl92w.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/70129558332ft5zr.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/gdDjhZe/rocket_launcher_ark_level.pdfIn PDF document text
    • https://rorekejufekate.weebly.com/uploads/1/3/0/7/130740186/mizavom_waxawapobopexa.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/hp_photosmart_d110_wireless_setup_without_cd.pdfIn PDF document text
    • http://lotupojaxuvutix.mygamesonline.org/sanozawawa.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/hgjjjDY/30717247441.pdfIn PDF document text
    • https://devigafaviv.weebly.com/uploads/1/3/4/6/134698058/guvezebotu.pdfIn PDF document text
    • https://cdn.sqhk.co/tivanosox/icWATWg/25691464396.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xukokumo.myartsonline.com/what_are_the_three_types_of_returnless_fuel_injection_systems.pdfIn PDF document text
    • http://boxijekew.atwebpages.com/how_do_i_inspect_a_used_car_checklist.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/what_is_tcp_with_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11e70c67-507d-4578-9ea6-b4f3cfda6a55/79945475869.pdfIn PDF document text
    • http://pupagerirawax.myartsonline.com/91792016659.pdfIn PDF document text
    • http://wegugoleta.onlinewebshop.net/jevamukekevodejusari.pdfIn PDF document text
    • http://jalijoruki.atwebpages.com/17633270368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd7fb4ed-3bf2-47bc-a155-a641bff7126c/software_testing_interview_questions_and_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_off0000e4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 5104 bytes
SHA-256: fd5329a40b12c21f4e670e21773079bd520fbb970567a654f66682a93255afad
font_01_sfnt_off0000f5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FF 9984 bytes
SHA-256: 5f5a084abbc2e1232bc7549003c9e8e8ab8b691346f748f2406df6eb1cdb0f0a

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