Malicious PDF — malware analysis report

Static analysis result for SHA-256 8686c3f430e2da26…

MALICIOUS

PDF

89.1 KB Created: 2021-03-16 14:44:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: be4811682d7bebb95414f407dc09a2d1 SHA-1: 17ff083ba7b1da0b3b1c2ec0d48f6e247cd5f43e SHA-256: 8686c3f430e2da26c1e2d5feac79cea240a30096b4b532c0517e2ac1bf2c9110
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, and the primary external URI leads to a domain associated with phishing. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://resalured.ru/award?keyword=9th+grade+math+word+problems+worksheets+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4492871/normal_5ff6af7d14351.pdfIn PDF document text
    • http://nanolenka.xyz/manilijofokavijanl1b.pdfIn PDF document text
    • http://zimipamus.22web.org/1092653005.pdfIn PDF document text
    • http://smartcreditcheck.info/panasonic_dmp-bdt220_remote_apps0yub.pdfIn PDF document text
    • http://nevoxukuri.22web.org/90138591902.pdfIn PDF document text
    • https://cdn.sqhk.co/lilanoto/Spaedwm/1663321144.pdfIn PDF document text
    • http://qunit.space/73023956425blxjv.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/ggj6gcY/70862677795.pdfIn PDF document text
    • http://zespodsvetkoy.site/quality_management_system_in_construction_pptla8cp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489412/normal_603bb3dbd8556.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xaxibalese.epizy.com/powarudobevapuva.pdfIn PDF document text
    • http://baxamavidoj.epizy.com/12542910361.pdfIn PDF document text
    • http://fegarezitima.rf.gd/tuzupisutewojewizexo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d1f71fe-08d4-4ff0-b2da-1113afde0b68/8963072270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a0fe840-e0fa-4e70-9c94-e414b9d94067/throne_of_glass_series_reddit.pdfIn PDF document text
    • http://tonaligu.epizy.com/fordham_class_schedule_2019.pdfIn PDF document text
    • http://jiwunix.epizy.com/download_matlab_mac_free_full_version.pdfIn PDF document text
    • http://zisafaziga.epizy.com/dimoguxosegaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2b20d64-df3a-40c8-8e36-e0b91a8b58c5/tozigu.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_off0001045c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045C 5812 bytes
SHA-256: 38a3cec480231d2633a1e4e5f3767cf2648fff3c5cb2a47195ede4b5c49eb10c
font_01_sfnt_off00011807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11807 11520 bytes
SHA-256: 20bb02ce98f38bce38904e4a325dfc643c91f3cfc9ff9a6d4a05ef5284a1cf03
font_02_sfnt_off00013f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9F 16096 bytes
SHA-256: b1012f06963c2aaa138b1a1b41ce61e53326fc85a5cb8e4a569fc08fe8587a25

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