Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf773fad4fd7697…

MALICIOUS

PDF

125.6 KB Created: 2021-05-30 23:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 04f01d939d2698bc570844e009bac89f SHA-1: d220ef26d14d76197c53a93faa0be617ed670822 SHA-256: 1bf773fad4fd7697d13afb3c73095c42e1636854c0fa50e5ba8b83c8880edc1f
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 0.9999

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://xajibur.ru/123?utm_term=pediatric+bp+chart+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448558/normal_60218debc89cb.pdfIn PDF document text
    • https://zajoxewamabovi.weebly.com/uploads/1/3/7/5/137503144/9007428.pdfIn PDF document text
    • https://toguxobuse.weebly.com/uploads/1/3/4/9/134902292/54632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393644/normal_6030694ea3d11.pdfIn PDF document text
    • https://nawuwisenaz.weebly.com/uploads/1/3/5/3/135318134/0d1422c16a.pdfIn PDF document text
    • https://wafodefa.weebly.com/uploads/1/3/4/4/134480145/ribubipepiji-tudupuvapupu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444114/normal_5fe15a8d685fb.pdfIn PDF document text
    • https://javesuput.weebly.com/uploads/1/3/0/8/130873829/visidunukekavavuzod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_6011103d9775b.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/0359d9f5-0bb3-43cd-a617-d48c2a741a43/gowipob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bef48e2-3bfa-47e2-93b1-9931426c4df8/kalogav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d97f97a-3bc6-4f08-b489-cdf16c228941/mtd_gold_self_propelled_lawn_mower_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da9ef7a8-7420-4687-b3ab-e262e0db23ad/16410872860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/275cab2c-19aa-436e-9de1-81c4066d6f5f/88819589413.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1fd9415-7bc7-4d45-89eb-bc3a9b7bc441/mia_and_sebastians_theme_tab_guitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f7c4fde-edba-44d0-b07a-8e8d25d309c2/zifuxo.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_off0001ae6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE6C 5176 bytes
SHA-256: f678c9987759f7de210f967e4a302ac5a15d55eb19707269e445f1480d9badb9
font_01_sfnt_off0001bffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFFE 12560 bytes
SHA-256: c50abb494a2daaa6119a1f60d4640774b273234155c2545a17a99f304d44d493

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