Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ddac1174c12914…

MALICIOUS

PDF

81.5 KB Created: 2021-03-20 10:50:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e043d0738acdbdf95b83994d7bd76f3c SHA-1: 9a5b32a4df196e53eeb622cf6304bd75cfc27f57 SHA-256: f3ddac1174c12914936ff48893a8ddcf258902c8d93463b58ed1443bcb4e4641
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 0.9998

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://xajibur.ru/award?keyword=salivary+amylase+activity+pdf PDF link annotation
    • http://wotevolodux.iblogger.org/32687754688.pdfIn PDF document text
    • http://zakababonedip.iblogger.org/bawuxinonixogerejojuxol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451368/normal_6038192296f0f.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/fjcyFha/forbidden_racing.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/Uoidq2c/papa_pear_saga_app_store.pdfIn PDF document text
    • https://cdn.sqhk.co/zusisoko/igji4ij/nuclear_bomb_easy_definition.pdfIn PDF document text
    • http://mumiwimag.iblogger.org/amount_of_substance_questions_and_answers_ocr.pdfIn PDF document text
    • http://gibejujefuguxax.22web.org/paxoxokimujus.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/0icgihd/record_live_streaming_video_software_free.pdfIn PDF document text
    • http://wekeb.space/49510281363s5ky8.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/ieAgfhh/8029688557.pdfIn PDF document text
    • http://mefurolawexi.iblogger.org/cairo_maps.pdfIn PDF document text
    • http://ses-paypal.com/dulanulibiwavikufoziwhk07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382948/normal_60146b5263c47.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/takurugilij/kozepetujizegikefapovo.pdfIn PDF document text
    • http://tenedurexijipes.epizy.com/24951930652.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/mole_to_mass_stoichiometry_problems_worksheet_answers.pdfIn PDF document text
    • http://somesituziki.epizy.com/zodaleva.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/pevajugipefiwesibowipaviz.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_off0000fbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 5564 bytes
SHA-256: 16825124faa717dda71c5b9564acdc735e19668beb09bc1337a4287275bd5521
font_01_sfnt_off00010ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECC 13048 bytes
SHA-256: f1720331036c3234529aece10bbe6920fb335e096f0957ea0dc9a4f22421a46d

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