Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb2875b9436dfc6…

MALICIOUS

PDF

70.9 KB Created: 2021-02-28 09:03:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c32331fd9a0f57ecfd6127452367ee71 SHA-1: b3351fc1bc6b6faf5f305f00398ad03bee1b4a9c SHA-256: bfb2875b9436dfc65b26b76c4ab295269364c0c99dda0a5c93e410c5a5dd9f28
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded links to external websites, many of which are hosted on disposable domains, indicating a phishing or link-farming attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/aws?utm_term=how+to+change+settings+on+safety+1st+thermometer PDF link annotation
    • http://borejukeluteva.mygamesonline.org/tree_of_life_movie_streaming.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426062/normal_5ffa1b6d43bc1.pdfIn PDF document text
    • http://ridovise.sportsontheweb.net/mejikokigeboxi.pdfIn PDF document text
    • http://timinome.getenjoyment.net/why_is_my_honda_lawn_mower_not_starting.pdfIn PDF document text
    • https://votaxejasusax.weebly.com/uploads/1/3/0/9/130969278/jutulu-velaruf-dosunovikix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405193/normal_5fd6779e18aa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387938/normal_6021642bc8e99.pdfIn PDF document text
    • http://pusewuvi.medianewsonline.com/felix_dennis_how_to_get_rich_ebook.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/asus_rt-ac66u_firmware_downgrade.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/336053.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503617/normal_5fde30e6da97a.pdfIn PDF document text
    • http://kovuzaxaf.medianewsonline.com/ditegufatane.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dekogamik/64374616584.pdfIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/sobalonat.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/what_are_the_four_social_media_zones.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/majatofo.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/dezig.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_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 5468 bytes
SHA-256: 39dc49deaf203fc8dae787def81f543ed2a0e58aff01b3a1651f992f17db0444
font_01_sfnt_off0000ea79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA79 10444 bytes
SHA-256: 87dc2380d7e901e6cecaa1357fbcc985d150b8e2744e0641605a93ac15655106

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