Malicious PDF — malware analysis report

Static analysis result for SHA-256 9679ae04f6b09c1c…

MALICIOUS

PDF

68.1 KB Created: 2021-02-22 15:47:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: b8257e3431898e08c55f16ba57fe6fae SHA-1: 6e6e7e52033f743d6766acef42146c3652ea1567 SHA-256: 9679ae04f6b09c1ce9ddd1d66882295cac830088d66d6de088b99cdb9582446c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many external links suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/aws?utm_term=stanley+jumpit+600+review PDF link annotation
    • http://5coupons.info/balance_sheet_format_software_freegohun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474997/normal_601bcc1cd11a2.pdfIn PDF document text
    • http://adanakebap.org/fosepirinalanagekulekio2hnm.pdfIn PDF document text
    • http://repair-telefonov.ru/free_hoodie_template_vectors9nna.pdfIn PDF document text
    • http://migriruy.ru/how_do_you_calculate_the_power_dissipation_of_a_transistora444o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489407/normal_600b15e257d6c.pdfIn PDF document text
    • http://topsale.pro/65343877234l6bhw.pdfIn PDF document text
    • http://lalashoppen.online/gevelujidixu1ld7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383295/normal_60338d96313a2.pdfIn PDF document text
    • http://snatural.space/rinisup6zrer.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/hakIrjf/angry_crab_tucson_az_menu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492278/normal_601471392f0c3.pdfIn PDF document text
    • http://tesocoin.online/snakes_on_a_plane_soundtrack_release_date64e0c.pdfIn PDF document text
    • https://cdn.sqhk.co/rewaloxuruvu/4Q1mN2L/moto_loko_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/Biahagf/14820385840.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3A 5516 bytes
SHA-256: decba89f2fee459f6ac66fb067392b3a025f23e609776bf077a3424cfb89ab17
font_01_sfnt_off0000ddfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 11216 bytes
SHA-256: 87702bc755336931fa317d482668b28f827aa71682d072da636e9764c2343477

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