Malicious PDF — malware analysis report

Static analysis result for SHA-256 a998f2d2d25f8c75…

MALICIOUS

PDF

79.3 KB Created: 2021-05-20 16:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a760bd0b5316e0f47a091944136d8816 SHA-1: 50bc84473990e0ccf7ea08385d4d54b7ccd1bd00 SHA-256: a998f2d2d25f8c756b78bdd7c14d5eec09d578941dc1012737c415ace2c2f722
176 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. It uses a QR-code lure. 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://botokaw.ru/strik?utm_term=why+does+a+pendulum+eventually+stop+swinging+of+a+system+is+not+closed PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389090/normal_6067cb230f675.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449411/normal_5fedc2c7794f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459324/normal_5ffc2d2d6d021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379731/normal_601dad461a4da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393488/normal_6005fe1d4a462.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451021/normal_60694876ebe60.pdfIn PDF document text
    • https://tobalewaluwe.weebly.com/uploads/1/3/4/4/134437424/nesila-xiwabazaw-sujeguridu-nakezovovi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422914/normal_600e9e3d01e14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386094/normal_5fd08e621b885.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450634/normal_6005f8636d458.pdfIn PDF document text
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/zibisadulotubisiv.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/b3e72ae6-71be-439e-a849-08288f046a97/72110860188.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cef04a45-3fbb-4b64-851b-0b3fd92f5580/vilovoxowaruzomif.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/safumutajudadedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3871d1c-d3a1-457e-bf66-a1900446c475/gemabepadaxir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d9ac133-8e8f-447b-a031-f5627d1dba16/cateye_velo_7_wireless_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/swann_security_cameras_installation.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/69056977747.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/designated_survivor_season_2_episode_12.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/hallelujah_chorus_orchestra_parts.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_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 5740 bytes
SHA-256: 6879498031c1efbad3f542e0f0ab7128cc05bd4ec4a39003c4538f14af835d9e
font_01_sfnt_off00010946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10946 11224 bytes
SHA-256: 1962b4151879b3f355cfceb2d7f5c836038af690f1dee69183dcd91f1dff6e9b

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