Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4476bb7693dcde…

MALICIOUS

PDF

129.9 KB Created: 2021-04-02 07:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 131f324ee24a6bd34066993532409544 SHA-1: 57e83770d30aa878d92a059f3a5b9d97d83058cd SHA-256: ca4476bb7693dcdea635ebd775ae31a86599fc18fcc09876d9779c7b5288b760
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://crophysi.ru/strik?utm_term=projekt+1065+pdf PDF link annotation
    • http://gouliwer.online/866361792384pkyj.pdfIn PDF document text
    • https://xasigusuvenazuj.weebly.com/uploads/1/3/0/7/130739755/2672947.pdfIn PDF document text
    • https://lurutedus.weebly.com/uploads/1/3/4/7/134775874/9683054.pdfIn PDF document text
    • http://khareedforosh.com/93533598662t30pl.pdfIn PDF document text
    • https://loxazubak.weebly.com/uploads/1/3/0/7/130739809/bf7fadee0d41795.pdfIn PDF document text
    • http://nunesop.scienceontheweb.net/afrikaans_stories_for_grade_5.pdfIn PDF document text
    • https://nabesoke.weebly.com/uploads/1/3/4/0/134042749/bodedivor_sagojizufali.pdfIn PDF document text
    • http://nenegifivujaxu.mypressonline.com/zobir.pdfIn PDF document text
    • http://kovamuwaropepu.getenjoyment.net/lidifavivisoj.pdfIn PDF document text
    • http://pasadurasasagi.medianewsonline.com/rajilafatibedonikaz.pdfIn PDF document text
    • http://vobajujabu.mywebcommunity.org/joxetebavomapag.pdfIn PDF document text
    • http://telozurilesojo.sportsontheweb.net/8086_instruction_set_and_assembly_language_programming.pdfIn PDF document text
    • http://dipenoguzel.sportsontheweb.net/aunt_minnie_s_atlas_and_imaging_specific_diagnosis.pdfIn PDF document text
    • https://ruruzepekasoto.weebly.com/uploads/1/3/4/7/134753799/xogurari-loxavujek.pdfIn PDF document text
    • http://blankid.ru/yard_machine_3.5_hp_edger_oil_typetr8pl.pdfIn PDF document text
    • http://fofiwafajelerax.sportsontheweb.net/33058963269.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5767b8ae-6f4d-48ed-9a4b-06002a6cda56/76868018382.pdfIn PDF document text
    • http://fazaburifug.myartsonline.com/what_does_the_pit_symbolize_in_the_pit_and_the_pendulum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/096e44a9-862b-4cec-9a47-41f4e053b4b4/38076607279.pdfIn PDF document text
    • http://rewuwuja.onlinewebshop.net/xakujise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28733fa6-cd56-4e0b-bcca-41814a50c34d/how_to_clear_dtc_codes_harley.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a877b353-d701-40ce-aa1d-d3043b49006d/what_to_do_when_walking_alone_at_night.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
    • 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_off0001ab35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB35 5228 bytes
SHA-256: 8024931374fc36c0eb181bc11cb515cb893d88baecdfec472bedc6eb1c62d441
font_01_sfnt_off0001bd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD24 12604 bytes
SHA-256: c9c9b049af63c7c6826ba9ac312006020a1282aaed2bec78f79781f875822f39
font_02_sfnt_off0001e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E59F 16060 bytes
SHA-256: e02432191d952bf4ca0be4cfeafc10308785ce9d9f3781c3262e4e8a73b31f63

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