Malicious PDF — malware analysis report

Static analysis result for SHA-256 a967b486358f330f…

MALICIOUS

PDF

83.7 KB Created: 2021-03-26 08:11:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a354350b7180cd91c870bead8cb08ad0 SHA-1: 005613a6b3cfea7f4343beacce158de402c1ba4a SHA-256: a967b486358f330fbb3524f075e78e37b4c4ca56fb9ade659ad9c5acda8dfa79
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URLs suggest a phishing or content distribution scheme, likely aiming to lure users to malicious sites or download further malware. No scripts were extracted, but the primary attack pattern is link farming and potential phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/award?keyword=exercicios+de+analise+sintatica+7+ano+pdf PDF link annotation
    • https://sevafigetof.weebly.com/uploads/1/3/4/9/134902911/6d28c3.pdfIn PDF document text
    • https://cdn.sqhk.co/nomavunut/akk7Ghi/73895085326.pdfIn PDF document text
    • https://cdn.sqhk.co/dufikibagi/srhhchc/87003558063.pdfIn PDF document text
    • http://rimuzuvadan.22web.org/36133359498.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/gheQieD/luke_bryan_top_songs_2019.pdfIn PDF document text
    • http://stavki-na-sport.site/galaga_wars_mod_apk_downloadk846a.pdfIn PDF document text
    • https://gapakoxolu.weebly.com/uploads/1/3/4/7/134745497/728829.pdfIn PDF document text
    • http://legendnat.space/965816682452e15x.pdfIn PDF document text
    • http://shoppermarket.online/secondary_2_inverse_functions_worksheetxw7p2.pdfIn PDF document text
    • https://cdn.sqhk.co/zudusidesu/mZ0UGIb/progress_report_comments_for_second_grade.pdfIn PDF document text
    • http://milansit.space/is_intelligent_design_falsifiableb4b9f.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/FhbMmgc/univision_34_atlanta_noticias_de_hoy.pdfIn PDF document text
    • https://cdn.sqhk.co/kupujape/Njjhfti/alan_walker_offline_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/jiCgjhu/21562878661.pdfIn PDF document text
    • https://cdn.sqhk.co/butiluluvuk/Vibhhjg/learn_to_sing_online_for_free.pdfIn PDF document text
    • http://fuziral.iblogger.org/logo_quizzes_answers_level_4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duxupupin.epizy.com/speed_test_software_filehippo.pdfIn PDF document text
    • http://dugoneluxokudu.rf.gd/value_investing_stocks_to_buy.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/kaxanusalexukivowerumon.pdfIn PDF document text
    • http://kogavajel.epizy.com/letters_to_a_young_contrarian.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/95452838446.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 5256 bytes
SHA-256: 27ac98708c821042ea86d8c334883f583cdde3f6c7473dcea8cc5ec3b6d2e255
font_01_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 2116 bytes
SHA-256: 1f756b46481ac718095810e133e155ec1caf818687d25c20e8b002f727d713c7
font_02_sfnt_off00011510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11510 14060 bytes
SHA-256: 44a7d71d3f21e6f6e3a4e2128bf838fcf1a5f1ba48df2bcdc5d797818ba27fb9