Malicious PDF — malware analysis report

Static analysis result for SHA-256 824b963b911a4dc6…

MALICIOUS

PDF

76.9 KB Created: 2020-11-20 11:40:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 39882550e3167b0c7903356187237903 SHA-1: 2a17572dd33773d9e1a5362f3c8ff33d12e545f3 SHA-256: 824b963b911a4dc6849b9d148c834eaf009375d33a2dd8eaef1a6cc3e476e6a4
156 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 0.9995

Heuristics 5

  • 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.
  • 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://trafffe.ru/strik?utm_term=gta+san+andreas+hile+program%25C4%25B1+apk+in PDF link annotation
    • https://pixabetamomu.weebly.com/uploads/1/3/1/0/131070001/7468029.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/satudifin/pejunusutowepikiserix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d38e1d5a-a8d9-44db-88ba-9e883c707eab/20853265045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63b0543e-723c-4bbf-b00b-665572e17c41/25584214767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e9a2134-ac25-4537-86ad-80dcaeac2168/18038527667.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/lewawosivonidab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de0b83de-8d33-480e-83fc-697bee63789a/39486188844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b605a8fa-5042-4c43-ba85-88b0731b98c6/79538331995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f733d50-be94-47f7-8f38-73ad1fd8ae82/95695981346.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4881327-1180-4b4e-a85b-24979850c34c/25807660593.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/7.3_cell_transport_study_guide_answers.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_off0000c1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E8 5288 bytes
SHA-256: c4f43fa3497136d6321ca016dae8680855457bae49a3c96f0e3ff0f70daf5b0f
font_01_sfnt_off0000d3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AE 14256 bytes
SHA-256: 0e34e43871275cd77bb4c6e6fef31b0110762f82f80b7a5bf406f62446c97c8e
font_02_sfnt_off0000ff9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9B 16488 bytes
SHA-256: fc782a7f35c2388e8db0936464660155aed3357c859d4a2d62648aea5122fc11
font_03_sfnt_off00011616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11616 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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