Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ca6c5cbc9b3bb7…

MALICIOUS

PDF

71.8 KB Created: 2021-03-28 06:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 15ff0342fe6441e23ee7bda27cdb5c82 SHA-1: e8f49f169dce5976338d676438fd23a10097ede3 SHA-256: 22ca6c5cbc9b3bb74cc248bfe5ffb35e405f933351cd9777a4d89e645774f197
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains keywords related to a 'Wheeler remington 700 action wrench', likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://golowaki.ru/strik?utm_term=wheeler+remington+700+action+wrench PDF link annotation
    • http://mugukix.mygamesonline.org/waltzing_matilda_piano_sheet_music.pdfIn PDF document text
    • http://ideal-it.fun/keramupitovinepisevgsibq.pdfIn PDF document text
    • http://creamwalls.online/what_is_geography_ks3yt4tr.pdfIn PDF document text
    • http://proita.fun/4132786606177nua.pdfIn PDF document text
    • http://cmb-societe.com/learn_thai_free_downloadfwhu0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410447/normal_602f1e190e3c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475988/normal_5fe7968a8b41c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483836/normal_60068f40981bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452173/normal_600ae10e6f7d8.pdfIn PDF document text
    • http://wazalugele.22web.org/kodakovukuwisebo.pdfIn PDF document text
    • http://vorecan.fun/waxaxaxobo7dn2.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/personality_types_compatibility_infj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/professional_java_for_web_applications_download.pdfIn PDF document text
    • http://pizuzol.onlinewebshop.net/54708687024.pdfIn PDF document text
    • http://joketatam.epizy.com/most_beautiful_nature_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ba89893-eb73-4b57-bac0-e3ede49dec92/4708156623.pdfIn PDF document text
    • http://kowuvemanavo.rf.gd/advanced_filter_excel_copy_to_new_sheet.pdfIn PDF document text
    • http://tipokeviti.atwebpages.com/tricks_to_solve_quantitative_aptitude_for_bank_exams.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/29177013489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbaf9b91-3019-4021-9b67-66136ea8e7b9/series_of_unfortunate_events_the_end.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/185080fa-a288-45b0-9db4-5c7d1cfd4ad0/putunizofurikevewatudob.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/40980828678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ab14908-ceb3-4777-af04-e2c434438834/xuwekipesaxuguwedux.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/britax_b_safe_car_seat_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52125bd4-9c02-4a81-ab3c-dda9735cdab9/wirapovezeruzam.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_off0000cf7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7C 5152 bytes
SHA-256: 63b0d8cbd04b46ca26fbf02405e22afa2b877358b52cc4b5bf49e8337216b3f4
font_01_sfnt_off0000e0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EB 10092 bytes
SHA-256: 5511456b5d8c227e7221b87eb9f36ebb0a46b2d1c4747848dd1336b8ccb23bcc
font_02_sfnt_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71