Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd885ffad30a58f1…

MALICIOUS

PDF

88.3 KB Created: 2021-02-21 12:42:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2a729d94fc8a0631ba5472d96757f266 SHA-1: 311c3edc7067e3a2ad7aaea2d9033b0bb7d8b94c SHA-256: dd885ffad30a58f195ada215ee3ab505febbf8166dbb16732dde74b3f3857a43
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 0.9999

Heuristics 5

  • 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.
  • 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://leonvi.ru/wix?keyword=electromagnetism+worksheets+8th+grade PDF link annotation
    • https://cdn.sqhk.co/xivomojuf/1pcDiix/color_fill_3d_good_job_games.pdfIn PDF document text
    • https://renijekut.weebly.com/uploads/1/3/4/3/134306869/09506bc1.pdfIn PDF document text
    • https://devigafaviv.weebly.com/uploads/1/3/4/6/134698058/8088469.pdfIn PDF document text
    • http://alexsaf.ru/connect_the_dots_worksheets4uwpm.pdfIn PDF document text
    • https://cdn.sqhk.co/wanadujogo/Agjjghb/farm_management_programs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424013/normal_6001b753f18cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412394/normal_5fc6404c4d0ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490917/normal_5ff860fdbc6c0.pdfIn PDF document text
    • https://cdn.sqhk.co/rosojolude/gVBggL5/rekabirukabevefipilekal.pdfIn PDF document text
    • https://wojumujar.weebly.com/uploads/1/3/5/3/135396772/gisemazenamedi_moginivofofi_mipiv.pdfIn PDF document text
    • http://blablablacar.online/cepten_bedava_krte_mzik_indir58itq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484358/normal_5ff783a60bc6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453719/normal_60078bddd2cf7.pdfIn PDF document text
    • http://grigolia-studio.ru/wasteland_survival_hack_iosjtlo2.pdfIn PDF document text
    • https://fologonalufofu.weebly.com/uploads/1/3/4/6/134694067/9231061.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugavatakavupo.rf.gd/vusakagesedadelafim.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_off00011d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D24 5660 bytes
SHA-256: 756bbed4d75bc6056d3da52128cc084039808fb2ac92dee768399948363f35fe
font_01_sfnt_off00013045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13045 10536 bytes
SHA-256: 176cc46df9d6e87d35545652a0591932b3bb16cacbe1ec8702d0f67cb836985f

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