Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1a8b97aecdfd50…

MALICIOUS

PDF

103.9 KB Created: 2021-04-18 04:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d15c48961f98b4df8caefdbde1b875dc SHA-1: b0bef4d569700c188733e84df7a1290d79c2d07c SHA-256: da1a8b97aecdfd5019e166fb8f224666022c0cace1593e680ed3457dcae67a74
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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 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://leonvi.ru/strik?utm_term=determine+the+kinds+of+intermolecular+forces+that+are+present+in+h2o PDF link annotation
    • http://tronreserve.online/2008_jeep_wrangler_rubicon_problemshtz04.pdfIn PDF document text
    • http://ulekschool.online/todawakukeveju490j.pdfIn PDF document text
    • https://fufobulevuzim.weebly.com/uploads/1/3/4/6/134650144/8339844.pdfIn PDF document text
    • https://cdn.sqhk.co/nexetifosam/jinJ9LX/78816438713.pdfIn PDF document text
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/wukepaf_guvedita_zawipimuvef.pdfIn PDF document text
    • http://whalesqpa.fun/72234601226oftmn.pdfIn PDF document text
    • http://proita.space/how_to_make_epsilon_sign_in_latexpofjb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489050/normal_60300e85eb5c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481064/normal_5fd619b1647c4.pdfIn PDF document text
    • http://kpupnov.pro/dante_infernoji1l7.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/bxUDHQE/guxajabizevoxasutaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://futuxirupim.epizy.com/professional_assembly_language_richard_blum.pdfIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_6017c474f0e34f2eb25bd848e2b8ef53.pdf?index=trueIn PDF document text
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_fbf4da7647e74c27a335b338781a962c.pdf?index=trueIn PDF document text
    • http://tatinovewetede.rf.gd/arduino_nano_3._0_usb_driver.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_off0001415f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1415F 5592 bytes
SHA-256: d5ae1a7fd3d1ef4338acfdfb2110121ea1f368945063fedd1164b71da0faec71
font_01_sfnt_off00015443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15443 11280 bytes
SHA-256: f041ccb4841b1e4e2d458a2a9fc1087aa620b0c98728a0afa50136de4e9ca3ce
font_02_sfnt_off00017b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B12 16260 bytes
SHA-256: b1b93bf558ee65cf174bdde98fc70b39c77ddcfeef9d3a00758a58eb2f24951c

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