Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e10e94db5bf47e8…

MALICIOUS

PDF

80.9 KB Created: 2021-03-09 07:25:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b893340f4bb2950caf4632dd5153da53 SHA-1: 9aaa47f09fd77ec588ccd872899fb95ccb9119b1 SHA-256: 8e10e94db5bf47e8b135820b6590c94d6bbbdf5233ed96a4c7d36a0f5bf38891
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 0.9991

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://kuzutuzo.ru/award?keyword=origen+del+liberalismo+pdf PDF link annotation
    • https://xapowukugo.weebly.com/uploads/1/3/4/7/134702937/dinikut-nubuneg-keraruxiropun.pdfIn PDF document text
    • http://reduslim-ordina.site/prozac_nation_librocz6j5.pdfIn PDF document text
    • http://smotrikino.fun/derivative_rules_sheetb13jp.pdfIn PDF document text
    • https://xilexuluta.weebly.com/uploads/1/3/6/0/136094269/mopuzerepumib.pdfIn PDF document text
    • https://luxabilep.weebly.com/uploads/1/3/0/8/130873941/2ac141cd634.pdfIn PDF document text
    • https://gemuvubakada.weebly.com/uploads/1/3/4/4/134494784/6361350.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375095/normal_6044db1f09bda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477137/normal_6035cf3398a78.pdfIn PDF document text
    • https://dotozirijekuzo.weebly.com/uploads/1/3/4/3/134315872/nefoxoxot.pdfIn PDF document text
    • https://rewizefugubopu.weebly.com/uploads/1/3/4/2/134266162/vebufifakepa-posilidevikobin.pdfIn PDF document text
    • http://clobuss.ru/zd30_turbo_prices_in_south_africa1077p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_6030ce2ce2928.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426676/normal_5fed567dd0509.pdfIn PDF document text
    • https://nakaporona.weebly.com/uploads/1/3/1/4/131438848/zujozapafujamig.pdfIn PDF document text
    • https://velalozelo.weebly.com/uploads/1/3/4/4/134498802/gadevolofowunez_lusesizoxeba.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/2gbleGF/dazokezenu.pdfIn PDF document text
    • https://cdn.sqhk.co/goxufime/eTWhfSH/92344877092.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476947/normal_5ff4fbd382c4e.pdfIn PDF document text
    • http://creditscoreusa.info/tom_clancy_jack_ryan_books_listrw9s2.pdfIn PDF document text
    • https://lilikegemuvil.weebly.com/uploads/1/3/1/3/131398424/dozilokulu.pdfIn PDF document text
    • http://wiinorama.fun/how_to_pair_motorolaekpqn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_9a714977c98d45b69196003f854df976.pdf?index=trueIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_8cf119c0efcb4b4391ed940d82bc5ac2.pdf?index=trueIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_8259581bc8194198a0d5e25fb425978a.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_off0000fdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 5528 bytes
SHA-256: c6814af49d936d58814ff2acc4794393e426b034647bca7b9fb5c1d6dffbddeb
font_01_sfnt_off00011095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11095 10956 bytes
SHA-256: 32ff762c2a5ce1426df88562aa8a36f326e41ff456ad36a16df78406dd7969ad