Malicious PDF — malware analysis report

Static analysis result for SHA-256 312403873d6dc6ea…

MALICIOUS

PDF

79.2 KB Created: 2021-03-21 01:43:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 590e5f6df68d72a01b4f6a8740b06444 SHA-1: 14a0dddf211314d23ddaa668a589b80286086a13 SHA-256: 312403873d6dc6eadc1ff3aad07ea0cb5e0b4435100e06811cceaa0d33043375
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body's content, combined with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, points to an attempt to trick users into visiting malicious websites under the guise of providing study guides.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/wix?keyword=cen+exam+secrets+study+guide PDF link annotation
    • https://nokibuvekunel.weebly.com/uploads/1/3/1/1/131164430/4509352.pdfIn PDF document text
    • http://flash-sar.online/aircare_ma1201_whole-house_consolepxlkg.pdfIn PDF document text
    • http://ribavid.medianewsonline.com/2691395983.pdfIn PDF document text
    • https://cdn.sqhk.co/jivaduzar/geqdicQ/dls_2019_real_madrid_apk.pdfIn PDF document text
    • http://tamasolesodaj.mypressonline.com/9631476812.pdfIn PDF document text
    • http://insta-sale.site/will_there_be_a_season_9_of_fairy_tailj0xz8.pdfIn PDF document text
    • https://cdn.sqhk.co/zitiwofiru/zighfhf/skater_kid_cartoon_show.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/emerson_50_inch_led_tv_screen_replacement.pdfIn PDF document text
    • https://cdn.sqhk.co/sulubejes/gciih3d/kpop_wastickerapps_korean_stickers_for_whatsapp_iphone.pdfIn PDF document text
    • https://lopamazaveseku.weebly.com/uploads/1/3/4/6/134643240/a1e2e8.pdfIn PDF document text
    • http://vebifitapex.mypressonline.com/kusatusumumivanaj.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/sony_fs5_used_ebay.pdfIn PDF document text
    • http://sagedix.medianewsonline.com/macarthur_capacity_assessment_tool.pdfIn PDF document text
    • https://sadebisoj.weebly.com/uploads/1/3/2/3/132302749/wajefozekoso_pukubat_musagike_naxuzujunesan.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/ihDsWjb/major_mayhem_2_level_30_3_stars.pdfIn PDF document text
    • http://abwaab.su/13218206970ik57h.pdfIn PDF document text
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/gezorizufim_nevinut_vabaluw_rijasutusu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vorisenunajix.myartsonline.com/the_city_and_the_city_book_review.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/xifopuzovolegogekakeniza.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/poliwujudim.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/dodufodukaferiwitot.pdfIn PDF document text
    • http://resilasijajatil.myartsonline.com/conservation_of_energy_worksheet_answers_state_the_law_of_conservation_of_energy.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/11th_half_yearly_answer_key_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/xulirobi.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/nixitipuremede.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_off0000f99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 5304 bytes
SHA-256: 8747494c767f2304afe8532037a54bca127651c8cc904705fc9d3ec1a73c8f9a
font_01_sfnt_off00010b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B98 10500 bytes
SHA-256: f510d0e55bc604490f2c0d5271932744e0ee401dc116ac57e3d29523203ae6e7

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