Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0e98d32987a309…

MALICIOUS

PDF

75.5 KB Created: 2021-05-31 13:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c88027d173d990b2772884ef66f93a66 SHA-1: df49f6c9974b05497761488de9b1057d0697f4aa SHA-256: 7a0e98d32987a309005665a3080620bb939d9c736d3924062e68bf727f9f73d3
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 0.9997

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=how+to+use+logitech+g29 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407331/normal_60461c2ec7dac.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4390052/normal_60b356c55c466.pdfIn PDF document text
    • https://likiroji.weebly.com/uploads/1/3/4/5/134526819/sotire.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4403954/normal_60b27d77bcf71.pdfIn PDF document text
    • https://dovezoluwebib.weebly.com/uploads/1/3/4/0/134017866/6253259.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4407062/normal_60b35b7d7ad0e.pdfIn PDF document text
    • https://pozategon.weebly.com/uploads/1/3/2/6/132695347/mideralakilojob.pdfIn PDF document text
    • https://tibirodemoxojuf.weebly.com/uploads/1/3/4/3/134336787/1889480.pdfIn PDF document text
    • https://lubojedibejet.weebly.com/uploads/1/3/5/3/135329630/virimamir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456165/normal_60393d35c4b9a.pdfIn PDF document text
    • https://tasagimaxo.weebly.com/uploads/1/3/0/8/130813305/fuxelixete.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503578/normal_60538f71da45a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473384/normal_5fcaa23031c68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465257/normal_605b7ed42ecc3.pdfIn PDF document text
    • https://gavaxavudo.weebly.com/uploads/1/3/4/5/134581950/fivig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481166/normal_5ff64adae8826.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/d50b2b71-de04-41d0-9405-1e9ab71846b3/41860953166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2ecb944-29cc-4516-935d-e82eb0921a5b/what_is_the_main_idea_of_the_ones_who_walk_away_from_omelas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a40f1f32-f810-4e16-8819-cf4ea1ed015b/sewogigujugilazujeko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/125af054-b358-41b9-98c6-e2148831680e/benisefu.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_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 5096 bytes
SHA-256: a5591fcdccf5e4d2e977149a31906e7ffc296e90498f8742c1c4f9831738f9d5
font_01_sfnt_off0000fc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC23 10728 bytes
SHA-256: ae9d1e8758e88c3c0fe26f182f633fa83ffff530e33b0a25c5fc12d4d53bad62

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