Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ac7f6cb0f7060b…

MALICIOUS

PDF

79.9 KB Created: 2021-03-27 19:27:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 20559054f57495ca3cde8487de7d5371 SHA-1: deb41200d461e156c481698c8cfce1b73f22f685 SHA-256: 19ac7f6cb0f7060b5b4f320a0203740ce22d35f1197072203858c87d23b4ed82
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with a primary one leading to 'xajibur.ru', suggesting a phishing or redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting many links on disposable domains, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://xajibur.ru/strik?utm_term=spoken+english+grammar+practice PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4505699/normal_601af55ee42cf.pdfIn PDF document text
    • http://dreabling.online/tetigubikup81bh.pdfIn PDF document text
    • http://kuwawaf.mypressonline.com/wopokupagolejakixok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480594/normal_60530948b2814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481072/normal_602f0134347af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384028/normal_6005f5dfbf7b1.pdfIn PDF document text
    • https://febefadu.weebly.com/uploads/1/3/1/4/131453100/xanoditobono.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408858/normal_6008ddf543a9f.pdfIn PDF document text
    • http://yozi.store/poboritovolofgs61c.pdfIn PDF document text
    • http://forpost-electrica.ru/the_way_of_the_peaceful_warrior_reviewhcuy5.pdfIn PDF document text
    • http://pirunumilusarib.sportsontheweb.net/major_themes_in_macbeth.pdfIn PDF document text
    • http://jefevivavifax.scienceontheweb.net/oxford_dictionary_english.pdfIn PDF document text
    • http://wosozage.mypressonline.com/telugu_calendar_2020_usa_new_jersey.pdfIn PDF document text
    • https://vomomojivebaju.weebly.com/uploads/1/3/4/5/134599032/sadedudizinibi-wobezizirawut.pdfIn PDF document text
    • https://gimepaponu.weebly.com/uploads/1/3/4/6/134614910/4635332.pdfIn PDF document text
    • http://bestsaleshopin.xyz/80010646197g5fw5.pdfIn PDF document text
    • http://losinglotterynumbers.com/taganufut6ts0j.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/32663509-104a-4ebb-bbb5-442621b52e7f/redikonajokisuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17aab1b5-258e-471b-a019-1601798b5db6/evermore_alyson_noel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/460f3682-8974-4b13-97ec-939e60d9add5/61593630270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74f0fd92-3e01-4f2d-9edf-350f4227b565/kijevov.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/what_is_a_good_lock_pick_set.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/les_centrales_hydrauliques.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/91426938670.pdfIn PDF document text
    • http://vubuzixefixa.onlinewebshop.net/longman_dictionary_full.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/arjun_kanungo_songs_ringtone.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_off0000fbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF9 5516 bytes
SHA-256: 384140924af2b85f16833fee4368dc5adcc448480eae43a86be0be1cc566893c
font_01_sfnt_off00010e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E91 10296 bytes
SHA-256: 3b649060d1a920eca0017dd093f38cc66d059a81f6fb19e5c7ef6c47b1699650