Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb43220adbcffb6…

MALICIOUS

PDF

82.6 KB Created: 2021-03-05 17:18:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: da6c98aa436652a90fc8fda2a12d1ef3 SHA-1: 95fa9cf1023485833ab812c0d8bda6c03f52ef27 SHA-256: ceb43220adbcffb69b29cdadcb6dcc59c10501d8d16472b7b5e8bbfb83d7752a
186 Risk Score

Malware Insights

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

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 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/aws?utm_term=cia+legacy+of+ashes+pdf PDF link annotation
    • http://jobs-ingenieur.best/tofawogeweg2e88e.pdfIn PDF document text
    • http://azakalaza3.xyz/poduwemaxogbc6.pdfIn PDF document text
    • https://cdn.sqhk.co/temisexezoda/m2jegho/monster_hunter_rise_release_date_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/gcy86TD/3d_heart_drawing_with_pencil.pdfIn PDF document text
    • http://rollernefrit.xyz/community_definition_sociologywagx0.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/geiijdo/pesipidofo.pdfIn PDF document text
    • https://cdn.sqhk.co/zofukumane/Bjjhchg/country_friends_vet_clinic_in_royse_city_tx.pdfIn PDF document text
    • http://dixuvexawob.22web.org/url_rewrite_for_iis_6._1.pdfIn PDF document text
    • https://cdn.sqhk.co/burajugi/gjKBUhg/norufowirorikafopixiw.pdfIn PDF document text
    • https://cdn.sqhk.co/fisejadiruw/hhg7oha/18646580732.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/6F7Yhji/40614143371.pdfIn PDF document text
    • http://snapchat-alert.com/what_baby_formula_does_wic_coverbs2b5.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/ea1146e3-5274-42fb-9cde-de058904a71d/my_daily_choice_reviews.pdfIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_4b8142f23db34309b22d0c95f8c5cb21.pdf?index=trueIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_afd42cb044544e56be4a826ffd1e11c2.pdf?index=trueIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_d1c8bdf1a7bc4dc1a2e7012eee0dfd81.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5257328-d6a3-4089-af0e-f9bbc13fba23/ruxupirojuvaletibobotedu.pdfIn PDF document text
    • http://rabopusafat.epizy.com/56659513056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4802e22a-23ad-4c65-9d39-add634cc3c6f/bakapizik.pdfIn PDF document text
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_4816b254c45c4807affd73aed9f3b7d6.pdf?index=trueIn PDF document text
    • http://xevarefuwiku.epizy.com/install_hp_laserjet_p1102w.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8c72ea0-4991-48fe-97f2-46645c060414/benimojubakumakiwojigoz.pdfIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_528b11146bdf4133ba8b2a7211fc8030.pdf?index=trueIn 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_off00010795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10795 5328 bytes
SHA-256: 870d520d54bd9d782207d27e9ea1a72c5a274f4716a7026eda3f71d302144ef6
font_01_sfnt_off000119c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C2 10388 bytes
SHA-256: e6bb80246b41e4411f63af51f00b69d40d53486dedda19439a38df1d2a20d911