Malicious PDF — malware analysis report

Static analysis result for SHA-256 b407b80845ebdf84…

MALICIOUS

PDF

93.7 KB Created: 2021-04-03 01:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 90005dacce378c9eca92bef3a393dd11 SHA-1: 97b8aa9dd8ec60531db7e007a653fee609dbf421 SHA-256: b407b80845ebdf849aa6cdc6442464046124ebbc17dcb5806c59625d5e842c8a
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/strik?utm_term=nombres+de+dioses+dela+mitolog%25C3%25ADa+griega PDF link annotation
    • http://winwites.space/cambridge_lms_level_2_answersrta18.pdfIn PDF document text
    • http://goods-amzon.com/85202015517jkrdl.pdfIn PDF document text
    • https://dawejufajipamoz.weebly.com/uploads/1/3/5/3/135350304/736343.pdfIn PDF document text
    • http://kfnwejfnkwheklf.space/solubility_of_ionic_compounds74ke2.pdfIn PDF document text
    • https://cdn.sqhk.co/girasufu/Ujjzwzz/75060213836.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/bXarhSL/best_wood_carving_tools_electric.pdfIn PDF document text
    • https://vudujetejagug.weebly.com/uploads/1/3/4/6/134674723/fuborowo_puzed_porapikela_pilajagaza.pdfIn PDF document text
    • https://tiwilofudux.weebly.com/uploads/1/3/1/6/131606348/a2f4382cd844e62.pdfIn PDF document text
    • http://legrand-spb.ru/android_service_bindservice_examplebccw6.pdfIn PDF document text
    • http://ita-bio.space/51675418047wj7df.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/5c25b027-177b-4259-a4a7-793dc2b1a0de/vuliposabi.pdfIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_4f49174009354e8c89212bcd76afe480.pdf?index=trueIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_518480459f0f412dafe28ddf2a83db80.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/366f4e89-0fe6-486a-8f60-fd8238c0e9f2/how_to_put_a_brother_printer_back_online.pdfIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_473a387a1f6d4504a3ade7a361f221d4.pdf?index=trueIn PDF document text
    • https://a3abd3d7-f7e4-4b0c-86b7-ec358d8c805a.filesusr.com/ugd/97a3b3_14e46bcf3e8e4d2cb1f53f7b44e844e1.pdf?index=trueIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_5516e46f527143c19fa5d73cf5f9d101.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc7df9c7-31a9-42b9-afc8-c5bd329d3e95/fadopikivelunezuzofab.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_off00012211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12211 5308 bytes
SHA-256: e2ae5747681b4d8f2d3b37dafaf86eb3a89f1597e8b21329e6e861b9e018003c
font_01_sfnt_off00013400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13400 16928 bytes
SHA-256: 5be49e150c969e8fba55b6dfa2bba5a43565f1cbd06af05ef85b781ee8e612e2

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