Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79bea6cfdd743ca…

MALICIOUS

PDF

80.4 KB Created: 2021-04-02 01:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 012e3d22614e775033a206be86724af9 SHA-1: da65a63ac5a9e61715e9636a2134392fce3a6ea7 SHA-256: b79bea6cfdd743ca12eca8dcdd2bba0adc0c82b6054d14a30924844e7b1dfca4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9303

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://druttle.ru/award?keyword=que+es+el+analisis+foda+y+para+que+sirve+pdf PDF link annotation
    • https://rogebanapixiwo.weebly.com/uploads/1/3/5/3/135343373/kekaruvetizibo.pdfIn PDF document text
    • http://bigpleasure.ru/37053329559qkc4n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485296/normal_605ce7fd001a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369630/normal_5ff34722d0e75.pdfIn PDF document text
    • http://rent-nout.site/34347192907v8f7d.pdfIn PDF document text
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/suzafuzanosi-kirinoginise.pdfIn PDF document text
    • http://mini-cam1.club/fusee_gelee_switch_guidefmrt1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425010/normal_60663b185bfcb.pdfIn PDF document text
    • http://lessonsonline.site/beps_action_plan_13r46n5.pdfIn PDF document text
    • https://nijeliwawinezim.weebly.com/uploads/1/3/4/4/134497061/5703179.pdfIn PDF document text
    • http://handler-autoscout24.com/toshiba_satellite_l775d-s7222_batterya8gwp.pdfIn PDF document text
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/kipid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_7357d8e2e6744518800091f899c90469.pdf?index=trueIn PDF document text
    • https://536432c6-7160-4795-b32c-faef63afc1c8.filesusr.com/ugd/5e2347_1bd1e632633b4c29a8d2f6913466361b.pdf?index=trueIn PDF document text
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_896ac2ba5e444a7eba231880ca314d78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c3af161-bcf3-423e-9aba-dc35dc5c0c16/how_do_i_thread_my_bobbin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22ddc3ea-eabc-450a-b885-ed0dc140e277/sinetate.pdfIn PDF document text
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_12078b89d4ed40a7886f2df9497e7d40.pdf?index=trueIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_bbd04b5d488b405b8a170f566ff3852b.pdf?index=trueIn PDF document text
    • https://49d0234c-aae4-472d-9cb9-6192e9e03354.filesusr.com/ugd/a63595_4f572b68020b49bb892f67de0dc4df42.pdf?index=trueIn PDF document text
    • https://104e3d6a-8609-4a5f-ba89-88df40aeb326.filesusr.com/ugd/3cb22f_6d8238dedd13459e9a56a46f738a4645.pdf?index=trueIn PDF document text
    • https://b56e6f12-3f4b-4b75-bc29-9585eb3fba71.filesusr.com/ugd/73f0dd_9023d8636b4e42f79de73dc8c1be6e51.pdf?index=trueIn 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_off000104c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 5384 bytes
SHA-256: e9dbdf0a8848712a66fd4013009d2a3e8286f237fb0f836daa17bd39760365ff
font_01_sfnt_off00011730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11730 12316 bytes
SHA-256: 8bce18992f22e4276baede97c11edc3bd06001f02f89b6ee152535f7962432c8

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