Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fafad04f81feb32…

MALICIOUS

PDF

68.9 KB Created: 2021-02-13 18:23:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7ecec554f86255ed597a215dc3a5fc28 SHA-1: e49ff8c02dafe63fa79639476a6908f485b809fc SHA-256: 6fafad04f81feb326ff279eb2c6fa0e6e578c8ea1955ce4f8624eddf4fc18e74
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://bologen.ru/aws?utm_term=fannie+mae+guidelines+earnest+money PDF link annotation
    • https://dumisoxi.weebly.com/uploads/1/3/4/6/134625223/wawobonuxomari.pdfIn PDF document text
    • http://dimax-matrasy.ru/worewoxilemibefigufe08r0w.pdfIn PDF document text
    • https://tixusevonatafix.weebly.com/uploads/1/3/4/6/134611731/5791d3c3036c2.pdfIn PDF document text
    • https://kezugavamatuwe.weebly.com/uploads/1/3/5/3/135347357/71355.pdfIn PDF document text
    • https://bojuwakuxejekur.weebly.com/uploads/1/3/5/3/135347713/wofam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454984/normal_5ff5eb0ee93d2.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/23209633072pqmw5.pdfIn PDF document text
    • https://vasuwogi.weebly.com/uploads/1/3/4/0/134017955/nepivuzezalaxozojage.pdfIn PDF document text
    • http://exampl1214.com/60224768184wdorh.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/nufebir-wimosovepilok.pdfIn PDF document text
    • https://wupupuredizuso.weebly.com/uploads/1/3/4/8/134894828/c2d4d3d11d10.pdfIn PDF document text
    • https://zadivodewereb.weebly.com/uploads/1/3/2/6/132683121/3e727b3c.pdfIn PDF document text
    • https://dupudebokuvufex.weebly.com/uploads/1/3/2/3/132303235/2060952.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gijomifede.rf.gd/61117633733.pdfIn PDF document text
    • http://podugidak.epizy.com/64434150153.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/conclusion_measurement_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/83495327262.pdfIn PDF document text
    • http://xusemud.epizy.com/different_weather_worksheet.pdfIn PDF document text
    • http://muloluj.rf.gd/11035533056.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_off0000cf20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF20 5204 bytes
SHA-256: 3b8d2cca4c6e75ec12302a7617b052f0ae4d48465c00dc83feff3d4d6dd8cd44
font_01_sfnt_off0000e0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C5 11096 bytes
SHA-256: 803cd716bf10222897cf5f3812c74efc2303af673a125168b2e77dbfb5ac1b51

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