Malicious PDF — malware analysis report

Static analysis result for SHA-256 b730112aa983f9a4…

MALICIOUS

PDF

89.1 KB Created: 2021-04-04 01:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 23c260aee7052382c126cd1d01b4e93e SHA-1: 22a1d4d9c43220a34112710dcdbb22057ad24b02 SHA-256: b730112aa983f9a4327a1a7da35409baaa62edc40ccc490538bdbeb20aa4ef0c
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with at least one pointing to a potentially malicious domain (fokemale.ru). The heuristic PDF_SEO_LINK_FARM suggests the PDF is designed to host a large number of links, likely to distribute phishing content or malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://fokemale.ru/award?keyword=carcassonne+river+rules+pdf PDF link annotation
    • http://kedugobepuged.mywebcommunity.org/bose_901_series_1_speakers.pdfIn PDF document text
    • https://cdn.sqhk.co/zasukadumex/jggzDe9/rolufolinokulowotet.pdfIn PDF document text
    • http://pojebanidik.mywebcommunity.org/7486623022.pdfIn PDF document text
    • http://korixoludofuguk.scienceontheweb.net/4709798455.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/eBPjhgj/among_us_2_imposter_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/wusosekame/gjgjgLV/95204568429.pdfIn PDF document text
    • https://cdn.sqhk.co/sivadapexiri/ggIvFMc/lineage_os_android_11.pdfIn PDF document text
    • https://cdn.sqhk.co/jidevumedure/hcCif80/archipelago_botanicals_candles_soy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_6b35daf4482a4c06a589432b8dadd3ba.pdf?index=trueIn PDF document text
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_be7c06e518304dbdaf828b2ac820fe77.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f914555-0f56-495a-8a01-43717c167807/14727221355.pdfIn PDF document text
    • http://fumibilulad.atwebpages.com/bsc_nursing_1st_year_biochemistry_syllabus.pdfIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_b961e0e80dfc4a4bafef5eb2b873004c.pdf?index=trueIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_55d4e39f2b6c49dd911985aaf42d7b92.pdf?index=trueIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_46af8c26180d4746845cdfead227b54c.pdf?index=trueIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_a8f5ed74a04f4d9f9e5dffd03751086e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de416e31-a9a9-44e7-a411-be1e3300f8a8/what_is_the_difference_of_origin_and_etymology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19919609-3dc7-49b5-b966-bfe269118bbd/38365300447.pdfIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_4f7474b27a7e4d6ea9aad50dfa71a045.pdf?index=trueIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_85024d83219a4151be5bc3b39de1ee24.pdf?index=trueIn PDF document text
    • http://kopurelotalad.onlinewebshop.net/translation_reflection_rotation_dilation_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbc69e26-757a-49ab-bc49-640de55c12ba/44422032058.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/417e907c-f8f6-4184-b068-9fe8df93b81d/37207216312.pdfIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_a6e14fff1fd64a5d97db3be1ad7c5e11.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC0 5116 bytes
SHA-256: 53de79c29cd812f14f482c7a85d2c4b578d7821dd1e48d8efff31bfe772eda8d
font_01_sfnt_off00012d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D39 12320 bytes
SHA-256: 79c13e11413ae9aea0906ee99003370798490a722b35fc83133d044e1cd4fc52

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