Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0ba24ff55b6827…

MALICIOUS

PDF

86.7 KB Created: 2021-06-04 22:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d28e2d4fe119b867b4f8ded71945df30 SHA-1: 70b7270a305d4286c9247663a0a280c56ad23b5b SHA-256: ac0ba24ff55b6827685fc174f674f4dea1134d0998e60965a9e0e459d6a9de47
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/123?utm_term=mystic+messenger+yoosung+phone+call+answers PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dce23da4-8811-4a3f-ba42-7a76d5f60c12/dna_rna_and_protein_synthesis_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7294c27-23ab-465a-b8a9-fd2514f94ae5/91978284100.pdfIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144575055/23311147559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2631e736-2f81-4d44-afcb-aa3e477c4172/30296340520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ba1bd58-875f-4c78-84d7-0660c77809b3/are_ryobi_drills_any_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64fee8b8-3e5f-4b37-b87a-ec6b401151a2/61495177155.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1263475-d454-4347-9593-c10b88a448d9/army_surplus_tent_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b84a50fd-b7bc-4a47-91c2-209899caceb6/84257171753.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e0520c-56b8-4bf0-add7-ed12ab3c56e7/who_is_raizel_in_noblesse.pdfIn PDF document text
    • http://dejulagimu.pbworks.com/w/file/fetch/144545133/bufulipode.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/f/narendra_awasthi_chemistry_book_class_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9374fc80-e8a3-4fe2-80ed-fe63667f6718/best_farewell_speech_for_students.pdfIn PDF document text
    • http://tekitejug.pbworks.com/f/how_long_does_opalescence_boost_last.pdfIn PDF document text
    • http://vogituvu.pbworks.com/f/69110508425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccda51ba-9153-4a36-a344-de7cd074c8f6/mathematics_class_11.pdfIn PDF document text
    • http://pefagisunel.pbworks.com/f/plants_vs_zombies_2_gems_hack.pdfIn PDF document text
    • http://gutopevif.pbworks.com/f/57023633795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/051e0268-6963-4925-a2b1-dea36a627d38/jagimijapobosaxi.pdfIn PDF document text
    • http://nefusim.pbworks.com/f/52615830607.pdfIn PDF document text
    • http://duriwug.pbworks.com/w/file/fetch/144614862/66038257306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d84b486-7aa8-43d4-8224-cfba0ff78ca8/sogifuvumegodosifunojedo.pdfIn PDF document text
    • http://fajopab.pbworks.com/w/file/fetch/144620217/doririrekokod.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_off00011681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11681 5544 bytes
SHA-256: 2283e504f48dc2f8bc1b4be1fc43b0b0c1b2d0d4cc91f14ff592ab89ad860da7
font_01_sfnt_off00012957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12957 10580 bytes
SHA-256: 4010050cd68e103e87a48ae8e426b1e176bf2fc5143556e32a0db636d146720f