Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a04017b1247e7a…

MALICIOUS

PDF

80.9 KB Created: 2021-03-05 01:19:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7a411d99ca9ad164de086b3ad5b91d34 SHA-1: 11428a6681e1fcd4823867801732a3b99d67f89d SHA-256: 98a04017b1247e7acde9764e415771b4a3dd93ae476db06a84faa71c62d55308
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, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the presence of numerous external URLs points to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/strik?utm_term=fluke+435+operation+manual PDF link annotation
    • https://cdn.sqhk.co/faroziwe/je4ghjh/40172226802.pdfIn PDF document text
    • https://maladekokox.weebly.com/uploads/1/3/4/7/134745457/koxog-satilukerubu-reludunureto.pdfIn PDF document text
    • https://tajurasexir.weebly.com/uploads/1/3/1/6/131606020/5224210.pdfIn PDF document text
    • https://xekanowodupap.weebly.com/uploads/1/3/0/7/130739303/pokel-zolopedoto-ribaxil.pdfIn PDF document text
    • http://kavalibosesevu.22web.org/anime_bonjour_koiaji_patisserie_sub_indo.pdfIn PDF document text
    • https://xapodopuk.weebly.com/uploads/1/3/1/8/131856257/lidovupulapemebataw.pdfIn PDF document text
    • https://tulosiwawi.weebly.com/uploads/1/3/5/3/135326734/tazim.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/vudegibuzezemejubak.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/how_to_draw_a_dog_realistic_step_by_step_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/texivewa/cggifn4/84227995172.pdfIn PDF document text
    • http://xutefizil.getenjoyment.net/dgx_205_review.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/what_is_the_best_book_on_servant_leadership.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/simbolos_de_los_diagramas_de_flujo.pdfIn PDF document text
    • http://tejovotemikodes.getenjoyment.net/59027163720.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://paguxesij.myartsonline.com/why_was_the_second_agricultural_revolution_important.pdfIn PDF document text
    • http://jegudorutomowur.epizy.com/whatsapp_karna_hai_abhi_isi_waqt.pdfIn PDF document text
    • https://fdb0147f-387d-4908-9c93-1ccdb5bf775f.filesusr.com/ugd/aea2e0_cdee83842c5947a3aee32734a3b3af54.pdf?index=trueIn PDF document text
    • http://mobukug.myartsonline.com/samsung_galaxy_grand_prime_cover_case_bling.pdfIn PDF document text
    • http://tiriburud.rf.gd/zigeva.pdfIn PDF document text
    • http://puribisipup.atwebpages.com/are_germ_cells_haploid.pdfIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_7c274ee519f343ada7e0da72e0da3962.pdf?index=trueIn PDF document text
    • http://nozozuwovore.atwebpages.com/34676829414.pdfIn PDF document text
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_fd15a31a9901460e9a3bd501d8026c08.pdf?index=trueIn 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_off0000fb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB82 5180 bytes
SHA-256: c97fe8684b8374329453fbd97fcd64f1ab7adf88a1f2578020db766646ed664e
font_01_sfnt_off00010d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1E 12516 bytes
SHA-256: 8e3974919de25c7ec6111b7b7b4d23b0c9f7ba2546a95c8c66feb9dc1d34ca17