Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5683f3dc3283a3c…

MALICIOUS

PDF

80.4 KB Created: 2021-02-10 17:59:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0256bc8422be421f2ed2bc996052588e SHA-1: c8ede2c7d68131d5a86e074b2193441de048f901 SHA-256: e5683f3dc3283a3c59b8814559a72138790bc10d3c86dbb47349462ddedad027
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on disposable platforms like weebly.com and sqhk.co. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of this being used for SEO manipulation or to distribute further malicious content. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities or the delivery of a malicious payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/wb?keyword=free%20business%20powerpoint%20templates%20for%20mac PDF link annotation
    • https://cdn.sqhk.co/gexopoku/iaBONhe/58182939729.pdfIn PDF document text
    • https://metasabuvaro.weebly.com/uploads/1/3/2/6/132681671/dususowojama.pdfIn PDF document text
    • https://voluwunuzusiju.weebly.com/uploads/1/3/1/4/131452861/3723082.pdfIn PDF document text
    • http://frukt.fun/20406638025xaeva.pdfIn PDF document text
    • https://cdn.sqhk.co/pakiwujipubi/decx3hh/roommate_apartment_contract.pdfIn PDF document text
    • http://cardioactiveitalia.site/zidalerexanazul7k37.pdfIn PDF document text
    • http://fb-ig-violation.com/5603093110gupzx.pdfIn PDF document text
    • https://duvozeja.weebly.com/uploads/1/3/0/7/130739152/rupusojowaselejovox.pdfIn PDF document text
    • http://instasurprise.online/dungeons_and_dragons_5th_edition_torrentyxk8v.pdfIn PDF document text
    • http://tihefers.online/vakojodarazoxufeli0j36h.pdfIn PDF document text
    • http://wirelosine.22web.org/ccleaner_free_for_windows_10_64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388613/normal_6000c5907e04d.pdfIn PDF document text
    • http://idealica-uficiale.website/988786386206nxt0.pdfIn PDF document text
    • https://cdn.sqhk.co/kabutijefix/nMhzibi/23891143009.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/kotoku.pdfIn PDF document text
    • http://nofovukad.iblogger.org/team_iggy_azalea_song.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392853/normal_5ff80d5e9aea7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462974/normal_5fec05b79b901.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/Nhhifhe/bejawukiluzulimobudit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ximogubofew.epizy.com/24450134240.pdfIn PDF document text
    • http://zopefunexot.epizy.com/os_coliformes_totais_e_termotolerantes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 5228 bytes
SHA-256: ec637ac26a5a00b0c94aeecb83df34bd854d25b156119c571286817eeb999343
font_01_sfnt_off00010374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10374 10220 bytes
SHA-256: ace317596ae51e0ac1a7883390db59c4c4c470d233f722aa05b9446b0ed72c13
font_02_sfnt_off00012641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12641 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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