Malicious PDF — malware analysis report

Static analysis result for SHA-256 da799038437cc9b1…

MALICIOUS

PDF

93.7 KB Created: 2021-03-08 22:40:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: c79eba632bcc32b3132a9a8b134646dd SHA-1: 857dfc5c21a54119683b15c27805e4d3879c4047 SHA-256: da799038437cc9b1be85336faea59316cc94b3815e53b35e1092479ed8c3bd85
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one pointing to 'jacksth.ru' which is flagged as a potential phishing or malicious domain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host numerous links on disposable hosting, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content, likely a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=ajaran+sesat+di+malaysia+pdf PDF link annotation
    • http://stikc.xyz/tevapofuxewol87r1u.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/parts_of_speech_quiz_answer_key.pdfIn PDF document text
    • http://ita-fitness.fun/46219026724wncf.pdfIn PDF document text
    • http://cmbespaceclient.xyz/236923840345t1zk.pdfIn PDF document text
    • http://zelumefepa.sportsontheweb.net/lorop.pdfIn PDF document text
    • http://tradebot.space/76753381048khn03.pdfIn PDF document text
    • http://oneshops.space/besuweteniteralosodojigm20zh.pdfIn PDF document text
    • http://erogan-columbia.site/best_general_biology_textbookge0u4.pdfIn PDF document text
    • http://axecheat8.xyz/99442501479vtdjc.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/pobuzakivararetid.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/1ade5ef4-585a-4601-858f-2bb22743af19/rawawo.pdfIn PDF document text
    • http://liviwofuxa.epizy.com/what_does_rcm_stand_for_in_maintenance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba3ffac0-3261-4f67-8c98-db30a784751a/fateziwoliwarameb.pdfIn PDF document text
    • http://tabijuxez.rf.gd/titefazititexodosekifir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07d39c2d-be0a-475f-b3e2-3e5bde77825d/nozes.pdfIn PDF document text
    • http://fonimegalidoxu.epizy.com/2392245024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60a1a84c-8794-4da6-9015-670773bf6d9a/67732983308.pdfIn PDF document text
    • http://goludoden.rf.gd/is_clint_eastwoods_movie_the_mule_based_on_a_true_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20c3df83-26a1-4883-84ed-21a851878e45/tuluduwitemukisujiroxu.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_off00012a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A45 1768 bytes
SHA-256: a7830af281c6d7b61dc692724ea72cf36a7ea757c697155e9fdc4833d1a940fe
font_01_sfnt_off000132ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EC 5356 bytes
SHA-256: fa01db7bf02ff13e6e58bde51c2f61693fb1cb5c22a967a515b20a1240deea3f
font_02_sfnt_off00014518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14518 10732 bytes
SHA-256: 195ed7a976a3ec706de3450322e9f1579eca28d6c9dd7037c8cb551753e83ae9

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