Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3126b61c053454d…

MALICIOUS

PDF

77.5 KB Created: 2021-03-23 00:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a6266b2c2ab4726113e3ff43d3bb2791 SHA-1: 5ff59f92b31369d656e13b50b5ead2530055aa3a SHA-256: a3126b61c053454df7fea513f91c662fd48b357e802d431418d273abcc367c4e
156 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 0.9997

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 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.
  • 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://nipisod.ru/strik?utm_term=saeco+coffee+maker+reviews PDF link annotation
    • http://xuroriwonufuz.scienceontheweb.net/beginning_beekeeping.pdfIn PDF document text
    • http://nomokesus.sportsontheweb.net/ayatul_kursi_file.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/self_attested_domicile_certificate_mp.pdfIn PDF document text
    • http://wigageturuv.mywebcommunity.org/selbstschuldnerische_brgschaft_vorlage.pdfIn PDF document text
    • http://nipizakevenuvis.scienceontheweb.net/pibiwu.pdfIn PDF document text
    • http://tejowigasinafu.getenjoyment.net/what_spices_are_in_togarashi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/lamimezi.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/imca_dp_logbook_guide.pdfIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_a1c8158689f043fe93f4eb9b133b6072.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/polexebuj/71377606335.pdfIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_67d360dcfa6c43e19f8d31489e74baa2.pdf?index=trueIn PDF document text
    • http://bavevex.onlinewebshop.net/medical_terminology_list_of_terms.pdfIn PDF document text
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_2c23bd1e9c4648dba4e8d9bbfdbd8efc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/217ecec5-e256-4e83-9bc8-2ce2f4af4cdd/somejibakep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5581ac4-0ac4-49cb-9183-2033608afa50/berger_and_luckmanns_the_social_construction_of_reality_published_in_1966.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/column_subtraction_worksheets_with_carrying.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/feldman_government_contract_guidebook.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/71937683525.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/ff14_p1t6_extreme_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/garmin_gps_64_battery_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6dd3908-76b0-4d2b-87ce-a13342852e88/contrast_hue_saturation.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_off0000f0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 5312 bytes
SHA-256: 9bc055705c37b2d6cf5202fcc5734f46ee11e0b35c011b82bad2685cc46b026c
font_01_sfnt_off000102e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 10728 bytes
SHA-256: 95d5c8d6a9412fd811400891812c34ae492e8b8aec1d5ec54d83c4f4015dc8ef

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