Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6e756848aa84ea…

MALICIOUS

PDF

80.8 KB Created: 2021-04-13 16:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 98ead02a703b1b152a0f8974b62e4f07 SHA-1: aa1a8107965033c8967d7a6a20edd51f7df3fc59 SHA-256: 8d6e756848aa84ea946e3f400eb397fdda376743041f0c277665c9d16749be9e
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Woodworking hand tools basics' to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=woodworking+hand+tools+basics In PDF document text
    • https://static.s123-cdn-static.com/uploads/4445879/normal_5ffe2583258c1.pdfIn PDF document text
    • http://erogan24.website/domalikojuxutolekiwgpzkh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393488/normal_5ffeaa21e5c6f.pdfIn PDF document text
    • http://topcreditcheck.info/94309302163obxly.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/fapaxugezujustfhne.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503533/normal_603960c8a48b0.pdfIn PDF document text
    • http://dorightunion.com/ecu_sensors_and_actuatorsj9elo.pdfIn PDF document text
    • http://nejamaranidirit.22web.org/litifelox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408479/normal_6064772c12eaf.pdfIn PDF document text
    • http://dafujopinax.22web.org/java_programming_questions_and_answers_for_beginners.pdfIn PDF document text
    • http://insurancesouk.com/52319834976yz6ek.pdfIn PDF document text
    • http://lasleymarkt.ru/wesidejkrd5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452834/normal_602a0ba42a307.pdfIn PDF document text
    • http://pop-marketplace.ru/aliens_vs_predator_2_primal_huntoys92.pdfIn PDF document text
    • http://bigops.fun/size_of_small_football_fieldrwnxv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_7eb997b154c848d284975a98087c347b.pdf?index=trueIn PDF document text
    • http://junamatodomuwip.rf.gd/96935128789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7bd95ed-a79e-439a-bb1a-80e1f44c1e02/fopuzuviribuwolegojud.pdfIn PDF document text
    • https://87deab66-c645-46c6-955a-dbc2758d34a6.filesusr.com/ugd/302fc9_ba8df1c5858d497091c358dba3001336.pdf?index=trueIn PDF document text
    • http://nifukugobu.rf.gd/xigozumofatitotiwunotemaw.pdfIn PDF document text
    • http://xudukibulinu.rf.gd/ill_be_gone_in_the_dark_book_review.pdfIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_17581491c2334c0dbca9a244167db6c9.pdf?index=trueIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_7ac16e8986ee4d338731c6294414be4b.pdf?index=trueIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_29cc0c1b78eb45778065a48cfa91e51a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/956f8625-2d08-483e-b6d0-aad4dd8d0531/lost_and_found_at_school_book_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/438c3ac6-836f-4b46-a7d5-cfdb54f13c30/rutiseredezazanisuwizoze.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_off0000fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 5508 bytes
SHA-256: a865081c8b7667997a9f9cc638cfea70ed64e5f79567c55221622d57ad7a099c
font_01_sfnt_off00010ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF6 10996 bytes
SHA-256: 6f57207aea8a2040144ef9b8087f2a0ad8679ed5d8d803677ad38213874a7774