Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba409b214afcd305…

MALICIOUS

PDF

84.8 KB Created: 2021-06-10 04:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e1e538121075bb26743ed0de19674c25 SHA-1: e562bf150e61a56d5a36204786516171a867426a SHA-256: ba409b214afcd30521fc0dd27f5311370c656737d0db42e2bb611be0c245daa2
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://chcial.ru/pbw?utm_term=best+photo+video+editing+app+for+pc PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4501385/normal_60b238b91527a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410222/normal_60504edba49e8.pdfIn PDF document text
    • https://gitesadikelipa.weebly.com/uploads/1/3/0/7/130776331/vejega-kedepumod.pdfIn PDF document text
    • https://rilumegunelado.weebly.com/uploads/1/3/4/6/134615428/ead1cee12e40.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://berilizi.pbworks.com/w/file/fetch/144894993/old_tamil_songs_1970_to_1980.pdfIn PDF document text
    • http://sagidetubi.pbworks.com/w/file/fetch/144550833/fapulipegoluxu.pdfIn PDF document text
    • http://legesir.pbworks.com/w/file/fetch/144850974/example_of_recommendation_letter_for_scholarship.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eca45fc1-9df9-4919-9824-445edcf3e069/29741425291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1255a68c-799e-4c1a-9daa-0e6cec1fcca5/yamaha_01v96i_price.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/w/file/fetch/144517002/smart_goal_example_for_nurses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7def782-cc4a-4669-8869-84a3fbd643fc/jibuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6acda0be-32b9-4dec-b6d6-ade3c6ff3f94/10373500267.pdfIn PDF document text
    • http://dojejezo.pbworks.com/f/12926146231.pdfIn PDF document text
    • http://vajaxasave.pbworks.com/f/wodadoded.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2002f241-9b20-441f-9d3b-6e9b920774e9/69493069861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76ab2629-c15b-4968-82a8-979f13eacbbf/five_nights_at_freddys_4_free_download_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001024b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024B 5284 bytes
SHA-256: 4a317326f7a302ed32dc23ceaa7c264be7f66877af97406fa870df0d3006c094
font_01_sfnt_off00011440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11440 10616 bytes
SHA-256: 54e94927f05444693f0e43f9ac1e728060addda94db2ff3bafef8d23da9ab69c
font_02_sfnt_off00013839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13839 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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