Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec91c714ea542172…

MALICIOUS

PDF

88.2 KB Created: 2021-04-02 20:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d7fb58dbbbcb5f6d47fc336f246c4863 SHA-1: b69e4f13480df18d3e2e2e5d983086d4db65db5a SHA-256: ec91c714ea54217204855f76b306a775eafe1032794c4ca4778ca63afe35586b
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 0.9998

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://dafemum.ru/123?utm_term=tutorial+python+pdf+2019 PDF link annotation
    • http://lumacy.site/bill_gates_biography_book_free_download347i1.pdfIn PDF document text
    • https://bazofaxeretaw.weebly.com/uploads/1/3/4/8/134868688/ralowarateso-watovovo-kikuxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_604e421c0f896.pdfIn PDF document text
    • http://pixxel.life/pilemipovugakusoxe7hj5p.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/Wibhaws/50517230712.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505699/normal_6057b4f654edd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383577/normal_5fc9b2de03646.pdfIn PDF document text
    • https://cdn.sqhk.co/rotuzuwibi/eiggeuE/nipewovunejoramibon.pdfIn PDF document text
    • https://ximavubakalik.weebly.com/uploads/1/3/0/7/130776508/4214f27.pdfIn PDF document text
    • https://cdn.sqhk.co/lusesito/jZzn71L/facebook_lite_messenger_old_version.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/HifX3ha/baseball_card_collection_holders.pdfIn PDF document text
    • https://nudesobaxoxis.weebly.com/uploads/1/3/4/6/134666739/2cbf7328eb5fcb6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/846e5c00-8e01-4b4c-a669-112fc926d54b/7182173406.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/def44eca-7912-4072-b22e-759070d21037/what_are_the_methods_of_surface_mining.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0487431c-242f-49d5-969a-b05b017d57c3/what_color_were_the_mesopotamians.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fef0a58-7474-43de-b78f-572722aa4d33/vetiw.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/litub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c6ae6eb-1e2a-47d8-87f6-ca7f08e27604/toyota_corolla_2009_battery_size.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/fowurafutinenolu.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/sakanimovovusiwili.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_off00011c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3C 5484 bytes
SHA-256: 0bc133875643b63d3553da8e7deeb39f7dc038a631aec8e8cf89fc54d47b398f
font_01_sfnt_off00012ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE4 10620 bytes
SHA-256: e99db094e5b630abbd37a7766be16fee56d02c268b9ab69687f89509ad39f288

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