Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f108ae3e2b19e03…

MALICIOUS

PDF

70.2 KB Created: 2020-11-10 12:11:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 15c57a57bb05bc0a6dee8bc8ea698919 SHA-1: dfe4e961f3b6695aaa6cda06d91591f3b6d228c8 SHA-256: 8f108ae3e2b19e0300cf977de56923c0b3ce80ecee50293370408fa7b58cee35
244 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?keyword=dios+habla+hoy+biblia+en+ingles In PDF document text
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/sidejeko_daradilet.pdfIn PDF document text
    • https://wejakoguxi.weebly.com/uploads/1/3/4/3/134324676/jepazebatos_defipinumilas.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/vukavofoges-rigerodime-jadupozatifen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471704/normal_5fa4fecd56813.pdfIn PDF document text
    • https://kofemadaki.weebly.com/uploads/1/3/4/6/134675418/88f4002ece186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f97271b7b452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_5f997d7b7153c.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/7334041.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
    • https://s3.amazonaws.com/tojabixefova/biology_short_questions_answers_for_class_11_chapter_wise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b271088-0f97-4da7-bde8-c7d25d6d57cc/mufevok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/101344e5-a6f2-427f-9d64-ffa6fa555861/80505792308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c28edcb-7109-455c-ab31-a6fd696f9b45/nefegigibopojowagivu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD2 4800 bytes
SHA-256: d152fd60c3291ca61404dbdf532752332a2d0c63a93b8e9278035ceeb15efb4e
font_01_sfnt_off0000c01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01E 11508 bytes
SHA-256: b198091430e3f6c1e46489d79d167b279f6456fd872463fcf83bb2fa6ad4c2fd
font_02_sfnt_off0000e642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE642 16748 bytes
SHA-256: e604e807aebff49f1759b39e15c2e5edddd5b9d3e53d86321d7f7a8c447e9df9
font_03_sfnt_off0000fd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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