Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a328aff2aa5c83…

MALICIOUS

PDF

69.0 KB Created: 2021-02-28 09:57:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cca35785dc0f66771f573924bdeea3ba SHA-1: cd4cd82aeb6d714f75ec169f18f7038881fc4a24 SHA-256: f4a328aff2aa5c8350f0731cb04008f77a3b718afff5f31fd5d8fd0bac18f265
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 0.9997

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/123?utm_term=volunteer+training+site+catoosa PDF link annotation
    • https://cdn.sqhk.co/saturarad/igijig3/cara_setting_dvr_xmeye_online.pdfIn PDF document text
    • http://sewutaf.iblogger.org/kasizuturokuvalokejuluseb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476418/normal_6029963d2c035.pdfIn PDF document text
    • http://gibelineg.sportsontheweb.net/rubulabezewipemitobiwep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_5fd6198c405c9.pdfIn PDF document text
    • https://cdn.sqhk.co/simikimira/rDhigez/search_hashtags_on_instagram_stories.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486994/normal_5febe8d981e09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489969/normal_5ff46059053ba.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/what_part_of_new_york_has_the_highest_crime_rate.pdfIn PDF document text
    • https://cdn.sqhk.co/wosepimi/hgfjdrk/38575948363.pdfIn PDF document text
    • https://cdn.sqhk.co/kokizoxujojo/ejdghib/eddie_edwards_ski_jumper_movie.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/dewolubixobujabelo.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/noninuvimajogesenave.pdfIn PDF document text
    • https://cdn.sqhk.co/sowodopevew/dYVggRq/kingdom_story_brave_legion_promo_code.pdfIn PDF document text
    • https://cdn.sqhk.co/rukububibon/tyZHjjw/wovekopovowasuwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476947/normal_602f52200f121.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/ggEbNhi/homescapes_free_coins_ios.pdfIn PDF document text
    • http://jekebes.iblogger.org/enuresis_nocturna_definicion.pdfIn PDF document text
    • https://cdn.sqhk.co/zosurinipin/TidEieq/play_super_text_twist_free_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gupizamowakop.myartsonline.com/what_is_a_normal_accu_chek_reading.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/how_many_quarts_of_transmission_fluid_do_i_need_for_a_ford_explorer.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_off0000d270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD270 4932 bytes
SHA-256: dea95bec57bdd79de55981316eb2cdf26003620b9d9b5f85508bfb97aa679520
font_01_sfnt_off0000e34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34C 10560 bytes
SHA-256: 6cc3d4078e453e37a276f6aa96a72048746321c80d3836606a6b94c1a2c43aa1

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