Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c31f348e41b3246…

MALICIOUS

PDF

81.3 KB Created: 2021-03-31 14:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6eb8d377434a498c582babc10d83a876 SHA-1: 9d273934d0db0528b03b45d5c6f07f2cd14144d1 SHA-256: 6c31f348e41b3246100665bd70883d713a11c518af45edfe4ca23ab1ad35ca5c
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://jumiwimov.ru/wix?keyword=levana+astra+user+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4461234/normal_5fc999f461801.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/gdxAyjf/thronebreaker_the_witcher_tales_bone_talisman.pdfIn PDF document text
    • https://cdn.sqhk.co/nadetajagupe/ia2ghuK/wastickerapps_ff_stickers_for_whatsapp_emoji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464072/normal_604f9e2c11dd7.pdfIn PDF document text
    • https://cdn.sqhk.co/besopaja/fic3B3V/wetherspoons_app_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402533/normal_5fdd8500dd241.pdfIn PDF document text
    • http://sekelenogake.getenjoyment.net/manual_drone_visuo_portugues.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/oNaB9D7/consumer_reports_best_infant_car_seats.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/ibWXshe/ninja_turtle_fruit_and_veggie_trays.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453914/normal_5fcf04d52b56c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_596352cd651a4247bd38eb766b9fc4ee.pdf?index=trueIn PDF document text
    • https://cdd249b8-77b1-4a94-b024-8995efe4d959.filesusr.com/ugd/d394ff_a60fa9a5c83f4d8ebf97308e7e18650a.pdf?index=trueIn PDF document text
    • http://dopovis.myartsonline.com/the_monkeys_paw_short_story_vs_movie_analysis_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/5601745032.pdfIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_39038d1a397140c7b4e665292af70a7f.pdf?index=trueIn PDF document text
    • http://tifavamifikas.myartsonline.com/milpersman_1306_instructor_duty.pdfIn PDF document text
    • https://3a988cde-8684-4da7-9cc5-a1c078ef4475.filesusr.com/ugd/1f7474_e22ffb0f37ae4fcd8f66a4be608c2e68.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/daniwodug/54520348858.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 7

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_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 4832 bytes
SHA-256: 08dab1682a0c0decf77db72303658677256104ab2a892ba68fe2564be701aa88
font_01_sfnt_off0001124b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124B 11240 bytes
SHA-256: 5477a079597f43aeee5f49caed95615c5792aedc431c35bd9a47703a689e739a

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