Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca14a86ea171a6e…

MALICIOUS

PDF

84.9 KB Created: 2021-03-16 22:31:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3f3ba52f18ba7853a3f3b2640a20aaaa SHA-1: 527adaa36c8090338474a99b944cd0e7cebca69b SHA-256: 4ca14a86ea171a6e72a5efca9c6529b78ab38a186b5b32b0d7313774d065753e
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=bowman+unblocked+games+6969 PDF link annotation
    • https://cdn.sqhk.co/kewawukufiju/0gjjhr0/25073494579.pdfIn PDF document text
    • https://cdn.sqhk.co/legikowe/zgfibhg/96873249360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496381/normal_5fd2350e38dcb.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/A6Qghjb/stick_it_to_the_man_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475397/normal_603f33e6c708e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_911fc6b4fcac42cda534ddccc00a1618.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f255e50b-e60b-4816-851c-cdb82036cde1/54281098244.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/la_droguerie_ecologique.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dfd07b1-9791-4e12-9a4e-f353b8c7f165/is_ifit_worth_the_money.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/11090929158.pdfIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_08702a4c7a384c5192f5da1f742237d1.pdf?index=trueIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_53051f3c210e4e31bf6402cbb728ec85.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/89cea199-1b31-4886-ba09-e7c76879a4ab/nfl_schedule_2015_playoffs_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e1a7809-b0f1-43a0-873f-4b19e25bb656/control_system_engineering_by_nagrath_and_gopal_download.pdfIn PDF document text
    • https://521a9f5b-5c7e-4f25-a9e4-5446fb1b1975.filesusr.com/ugd/c1a494_aa4f3316e53a43a4b0590749654cd9c2.pdf?index=trueIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_4515b6b8d415418698684fa5f78b0118.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b34f4a1-c348-46a8-adaf-f42b517349ed/tematejuf.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/riparian_management_area_guidebook_bc.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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A78 5820 bytes
SHA-256: baaa7dfe64c6919c20bed461516ce267566876548718c5d59b48baf4a4c98ff6
font_01_sfnt_off00011e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3E 11860 bytes
SHA-256: 81149f7d2573fdc4861a1b3c3cdae9ee7732061c7e6aae003f5f5fef9fb84cdb

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