Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0c9f44d250a946…

MALICIOUS

PDF

86.4 KB Created: 2021-02-28 03:00:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a17098f5058c2f7a41d84fbfe4c77d2f SHA-1: 92fb50e7abc132241f099420f4045e9f4ece4dcc SHA-256: ef0c9f44d250a946fa017bb6b542cfb2d71ebf50e502638f99aaef1ff2a139d7
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://jottigo.ru/strik?utm_term=what+is+the+primary+waste+product+of+aerobic+metabolism PDF link annotation
    • https://cdn.sqhk.co/vatuliwa/EggmhgW/tic_tac_toe_strategy_pick_3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488317/normal_5fc6f0cde8c8d.pdfIn PDF document text
    • https://fewebiporunivag.weebly.com/uploads/1/3/0/7/130775920/jumodub.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/jiIgfrh/let_s_draw_3d_shapes_together.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/dQLFhha/monster_jump_jump_or_diesel_brothers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466411/normal_60117bde1abc7.pdfIn PDF document text
    • https://fagozozefixus.weebly.com/uploads/1/3/4/8/134846406/6406688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409093/normal_5fd8dbd910df9.pdfIn PDF document text
    • https://xoxajunun.weebly.com/uploads/1/3/4/3/134351876/1711005.pdfIn PDF document text
    • https://lizatupapej.weebly.com/uploads/1/3/4/4/134401074/bepusenumesab.pdfIn PDF document text
    • https://severuzilun.weebly.com/uploads/1/3/4/7/134710190/kumobabizav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xajowu/fiminomotafanexapifewedo.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/jijefuxenowit.pdfIn PDF document text
    • http://bagugexasorip.myartsonline.com/89676163461.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_off00011508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11508 5740 bytes
SHA-256: 1e019761425da440641f8ed751cd90c24b07df1136a835972d7eade2776f5145
font_01_sfnt_off00012889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12889 10420 bytes
SHA-256: 972f8eb8899e1592d114608645118aa28435681e8fb563f88d27870f7f54658d

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