Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf89b85860237528…

MALICIOUS

PDF

75.7 KB Created: 2020-11-19 07:51:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 729dc0ddff783e1273547666bae4ba89 SHA-1: d970bdf9bdb006e7fe1d96492c8c479c77344b14 SHA-256: bf89b85860237528757cef63d59da3eba8f007b24673514541810fcbd17848da
164 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 presents a deceptive download button. 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafficel.ru/strik?utm_term=arm+microcontroller+basics+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478132/normal_5fad4c6b2b340.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/12f53c87f87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5fb5fb1f1805d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490366/normal_5fa9a203db98a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/wiliz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f8d04eb-725e-478b-9a60-47fc901fa21e/gikonodewudejodudirenul.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/50071418211.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f688373f-648d-498f-8f9c-58eb9d35dace/pubutoxawefodogo.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/dungeon_masters_guide_1e.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/python_3_string_format_bytes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2992dc2c-05c3-42f2-8da9-2dbd67137438/wagekumonisaviw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52b4920e-8c47-49b6-92c5-febf23e75c8f/dogoretitulosabaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/children_s_books_read_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03244cce-be1d-4354-870c-c06a008c6599/futetodekamedebifibeza.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A8 5432 bytes
SHA-256: 6d51f0477b406edde0798bc2984cab0160cd70356a562342a8194dd8a49ee50b
font_01_sfnt_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 10320 bytes
SHA-256: 402f462d69abb2d572e294227682d1bc56d1d2cf5a7c3bbc325c4cf870052752
font_02_sfnt_off00010caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAF 16116 bytes
SHA-256: ee6d37e4d55c83e4992319dccf23001405a71c4ba88a6ec10df0eb4a652ba8f4

Open this report in the interactive analyzer, or submit your own file for analysis.