Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20eb564ecb5b87e…

MALICIOUS

PDF

76.7 KB Created: 2021-03-15 08:48:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f8e67401e527e9c39155690b387c512c SHA-1: 3c53d9e065d51631da2840cb2cb505798e8837a5 SHA-256: b20eb564ecb5b87e9d7294aef75ccdb70f07c5b76d0b8280f14c1cadfd5b1947
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://druttle.ru/123?utm_term=pleural+effusion+guidelines+2018 PDF link annotation
    • http://winewelimefavo.iblogger.org/pozefotilozalapab.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/hihrujd/33380464378.pdfIn PDF document text
    • http://vufiwopader.medianewsonline.com/hng_dn_ct_file_bng_nitro.pdfIn PDF document text
    • http://konalofasu.mywebcommunity.org/ranumiparedanebibeneb.pdfIn PDF document text
    • http://wijutomotagam.mypressonline.com/3ds_max_character_animation_tutorial.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/currency_and_capital_of_all_countries_in_the_world.pdfIn PDF document text
    • http://bugosegu.scienceontheweb.net/65712829401.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/jaujchf/54717141376.pdfIn PDF document text
    • http://juriravi.iblogger.org/vafilemanikuvaz.pdfIn PDF document text
    • http://neriwor.medianewsonline.com/vosenutipolevulifodugem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sodowurivav.onlinewebshop.net/what_happens_to_an_objects_kinetic_energy_as_speed_increases.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_f16a712c718c4c7a862231a773647a11.pdf?index=trueIn PDF document text
    • http://fuzinokozekinuk.rf.gd/vibegujakafudisifagegi.pdfIn PDF document text
    • http://povalimokuwov.rf.gd/79958079871.pdfIn PDF document text
    • http://zekubegem.epizy.com/fantastic_beast_and_where_to_find_them_creatures.pdfIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_d6a2b7f2bb324434a54574cdf295cbcd.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_110ccd2f00204a6eadb8fcb17807d210.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_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 5596 bytes
SHA-256: b0c3408dda49360bf8d6290813ef730ae8581411ee6650a47600e1928d7e1aca
font_01_sfnt_off0001007f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 11688 bytes
SHA-256: 8b2009160ce407fbbddc3ab77d3384b1e3882b7ca729954bb08ed39e836730ab

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