Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a8bf2f357af3cd…

MALICIOUS

PDF

84.1 KB Created: 2021-03-24 21:18:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c639a640613eebd93f8a2de03bc6af8c SHA-1: 57fbe3add730d4455c08116964b2d5f82c724c7f SHA-256: 44a8bf2f357af3cdc1f9ea8cfa0bd934813b1dee47fe285839f4d9f82367094f
186 Risk Score

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 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://botokaw.ru/wix?keyword=area+and+perimeter+word+problems+8th+grade PDF link annotation
    • http://kejurudoji.medianewsonline.com/asthenopia_adalah.pdfIn PDF document text
    • https://wozexapumodokeb.weebly.com/uploads/1/3/0/7/130738903/4521849.pdfIn PDF document text
    • https://cdn.sqhk.co/pinepopowig/hcicGwZ/7128572282.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/heijehj/bemuxetenipo.pdfIn PDF document text
    • https://cdn.sqhk.co/fonowatusopu/fjfV0hh/book_front_page_design_template.pdfIn PDF document text
    • http://penageli.getenjoyment.net/jiwigimupetilugatafubid.pdfIn PDF document text
    • http://damewumesigalut.medianewsonline.com/feburovamozamikev.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/jh8OhbI/rumble_hockey_creator_code.pdfIn PDF document text
    • https://cdn.sqhk.co/mipijotom/caidjaF/driving_school_cheap_prices_near_me.pdfIn PDF document text
    • https://raxugujelagad.weebly.com/uploads/1/3/4/1/134108814/9896747.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://piwolimosopobu.myartsonline.com/wanderungen_appenzell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d56589ae-0178-41a8-82c2-2c59fdb18ef6/denon_dht-s514_sound_bar_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e547c4a8-ac75-43bc-bad7-8cda35939481/37120146567.pdfIn PDF document text
    • http://japamitafixe.myartsonline.com/gre_word_list_magoosh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8e48568-84a8-4e0b-bee8-7aa2912010d3/livros_espiritas_para_download_gratis_em.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0e22375-5de5-4fa9-84c8-91e333c641c4/machinery_handbook_26th_edition_free_download.pdfIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_b45634006fb84dd1af48b321616322cb.pdf?index=trueIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_35b9fc09a5524d23a115cde24c02bc5a.pdf?index=trueIn PDF document text
    • http://toxifiv.myartsonline.com/aflatoksin_nedir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c88134d2-a42e-4f12-8c79-5eaf7db20eef/craftsman_yt3000_drive_belt_part_number.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_2278fb109eae437ab6a985c76de6351d.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 5788 bytes
SHA-256: 5f059772c898060d3de184ec1a3fe91c787a87222c1732d83d4430feecafd9f0
font_01_sfnt_off0001054b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054B 11700 bytes
SHA-256: 8ddf8e197bb45d8cbb882898e90d37736ed183183b72480ecf3e985c1583663e
font_02_sfnt_off00012d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D61 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15