Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e65123b078194af…

MALICIOUS

PDF

79.1 KB Created: 2021-04-26 13:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ea3bcf73a32a7fb9b347f87c1dc2f6b5 SHA-1: 98784e5a118a806f91bf980fb3fcdb02f9c81acb SHA-256: 0e65123b078194afe14b3887cd79e0f0c167735497791109432cf496c40484ed
186 Risk Score

Malware Insights

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

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 0.9992

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://maypoin.ru/strik?utm_term=firex+120-557b+replacement PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460465/normal_60618725848ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413567/normal_5fd94b00b4720.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450728/normal_6069c7bcdff81.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/wd_my_passport_wireless_pro_4tb_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527237/normal_60251af60d880.pdfIn PDF document text
    • http://risejesifisem.22web.org/paper_cup_making_process.pdfIn PDF document text
    • http://tetizeniwa.mypressonline.com/angielski_dla_dzieci_wiczenia_chomikuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413718/normal_5ff553cc65721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484118/normal_605408c47367d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_6031de7b98495.pdfIn PDF document text
    • http://girepodemaz.getenjoyment.net/alexandria_moulding.pdfIn PDF document text
    • http://kalukoroduro.mygamesonline.org/31633875422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_60653cb9a5de3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448535/normal_6060fa9682245.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_6c98842ef22e4e95a30ddd911f10fd99.pdf?index=trueIn PDF document text
    • http://xodenumaverap.epizy.com/the_adventures_of_sherlock_holmes_illustrated.pdfIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_193c82c88d574ad18dde6ae4539bb86a.pdf?index=trueIn PDF document text
    • http://kozogasivufi.myartsonline.com/rrb_je_algebra_questions.pdfIn PDF document text
    • http://pajoxewujovero.rf.gd/citidirect_be_user_guide.pdfIn PDF document text
    • http://tulajadulixo.myartsonline.com/design_of_asynchronous_sequential_circuits.pdfIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_d853ffd8447541f9beee6e3a1550d75a.pdf?index=trueIn PDF document text
    • https://d5bd316f-d7ec-45e4-b741-1baa04518ebd.filesusr.com/ugd/b1277d_5a434ad6394944a2aaac21b52631e91e.pdf?index=trueIn PDF document text
    • http://tipipigi.atwebpages.com/batman_arkham_asylum_comic_espaol.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_off0000f686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF686 5628 bytes
SHA-256: 2acefd156d7c7ed1d31c31aa473b2a53702976bd90409549d3e157450d7faadd
font_01_sfnt_off000109ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AB 10556 bytes
SHA-256: 5586fc11ca345b0c9fb80a874de8dae440038d4259d32891e92fddecba145c5a