Malicious PDF — malware analysis report

Static analysis result for SHA-256 68686fb735b2ab29…

MALICIOUS

PDF

76.5 KB Created: 2021-04-08 09:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 46b217deca0a8043bf8405f9d316efee SHA-1: c76820d060c79ccd4bdd85b2462889431e1b262f SHA-256: 68686fb735b2ab294dbc2a542ec1b92c4dad7d500f656f2d2a504e7a515c856e
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://baarspo.ru/123?utm_term=sample+loan+agreement+form PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478415/normal_60178a5b9f4e4.pdfIn PDF document text
    • https://tuxinotem.weebly.com/uploads/1/3/4/8/134883911/7522006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5fdc5cd9c44ff.pdfIn PDF document text
    • http://mopexaxurip.getenjoyment.net/57820629832.pdfIn PDF document text
    • http://dusamoka.mywebcommunity.org/new_international_business_english_updated_edition_student_s_book.pdfIn PDF document text
    • https://cdn.sqhk.co/jisesixerigu/tgdgjgg/reading_practice_test.pdfIn PDF document text
    • https://cdn.sqhk.co/vedoreket/geihHTo/66591814027.pdfIn PDF document text
    • https://bofeliwibetu.weebly.com/uploads/1/3/2/8/132814086/fe8b09cfe76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tajavuminona.atwebpages.com/45044328908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5c6be76-2af9-4873-8b6c-c5f506e2afae/vexogeraxosuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f1b790-c83a-438c-8823-0f80b6e77525/army_rifle_qual_scores.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/058b0ebc-7f7b-4558-ae40-d0739083d7d5/dozifezelij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89594d1d-2e8e-46f0-b5cf-038b30bfe768/ranger_boat_owners_tournament.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54cbad3b-53ee-4e97-919f-1275a3d6583c/toyota_camry_se_for_sale_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02a8eb17-3ae5-4929-9b28-d1e52dc459be/75473002924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82c9bae7-25ff-463c-b03c-05328c526cbd/constellation_map_wedding_gift.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab625526-c1c5-430b-b520-2643464bc264/mizukezugume.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_off0000ed7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 5144 bytes
SHA-256: bbf4dd983b9948976067c2f7908f31dbdcac043db7cc5a66b5e87f89f5790dcb
font_01_sfnt_off0000feea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 11340 bytes
SHA-256: 005cb46ff3e25ff735895b78a0c712baaa53a1ec64f56060d70b970de06457fe

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