Malicious PDF — malware analysis report

Static analysis result for SHA-256 52308f96f787ce47…

MALICIOUS

PDF

89.0 KB Created: 2021-04-05 06:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0d1df453d83fc78ebbc6e97209d067aa SHA-1: 57d5490ad71bc9eec1e61bde1b487e075c194942 SHA-256: 52308f96f787ce47da90c775e8d9808f5bff80ddf54c8748e8bf3de784c38167
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 0.9990

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://druttle.ru/award?keyword=alcoholismo+hereditario+pdf PDF link annotation
    • http://sikevemekoma.mypressonline.com/12118932516.pdfIn PDF document text
    • http://ductsunlimitedins.com/surezevolr4uq.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/convert_to_cdr_format_online.pdfIn PDF document text
    • http://fupopujewobajus.22web.org/audio_bible_for_pc_free.pdfIn PDF document text
    • http://ecosbor.net/why_is_my_computer_not_charging_when_plugged_inshzom.pdfIn PDF document text
    • http://storeeuro.info/8451844247fodgf.pdfIn PDF document text
    • http://pewujok.mypressonline.com/botella_de_klein.pdfIn PDF document text
    • http://pufimabakep.22web.org/kojabapavikev.pdfIn PDF document text
    • http://tozaworewinox.mywebcommunity.org/articulo_4_dela_constitucion_politica_de_la_salud.pdfIn PDF document text
    • http://elinekici.online/todabugowibul4ybf0.pdfIn PDF document text
    • http://limaxinsto.xyz/30143715505o6v4k.pdfIn PDF document text
    • http://mosoxiliraf.iblogger.org/calculating_percentage_increase_and_decrease_worksheet.pdfIn PDF document text
    • http://mitimewigupito.mypressonline.com/frases_basicas_en_ingles.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gujomodezeroj.epizy.com/setutuz.pdfIn PDF document text
    • http://wefexafunedex.epizy.com/amplitude_modulation_derivation.pdfIn PDF document text
    • http://genenapukiral.epizy.com/amortization_in_accounting.pdfIn PDF document text
    • http://jonesojawu.myartsonline.com/38536697952.pdfIn PDF document text
    • http://pujusojup.epizy.com/78168724198.pdfIn PDF document text
    • http://lodafudamisov.epizy.com/10209251471.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/tazumusejibazevexevuvidul.pdfIn PDF document text
    • http://segimoto.myartsonline.com/how_much_is_osha_certification.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/how_to_manage_stress_in_your_life.pdfIn PDF document text
    • http://jifisuxevizek.myartsonline.com/mazigeguli.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_off0001067e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067E 5384 bytes
SHA-256: 2a1175e1f167637e826e7a33c831d32fdfa46a9b2f194559bd3bef2519a3346d
font_01_sfnt_off0001189d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189D 11864 bytes
SHA-256: 7786de9ddc4853cd18d5c360da6afe9d961891f93c0ee31eb71a675e2b2e924b
font_02_sfnt_off00013f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F97 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449