Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c5005ef114e581…

MALICIOUS

PDF

78.5 KB Created: 2021-03-11 03:03:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 30834996e1b5e954ace4445df2ffc50a SHA-1: 0886911fc20ff3e28778704c6d4fa68db992302d SHA-256: a6c5005ef114e581e58291a93e2c9493ccebe9ba3bc5e108308194de07b439ac
134 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document uses an invoice or payment lure, combined with embedded URLs pointing to potentially malicious sites, suggesting it's designed to trick users into downloading further malware. The presence of external URIs and link farm heuristics further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/strik?utm_term=health+care+delivery+in+the+united+states+11th+edition+chapter+3 PDF link annotation
    • http://paxezimusosesa.scienceontheweb.net/kukesozofezagibasimugudun.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/govonafejanideg.pdfIn PDF document text
    • http://wejaduz.mypressonline.com/practice_ged_test_math_printable.pdfIn PDF document text
    • https://futesofabi.weebly.com/uploads/1/3/4/8/134891928/27f236d777f8.pdfIn PDF document text
    • http://busivel.xyz/joe_f_gurneyoj2ao.pdfIn PDF document text
    • http://mevakimuvu.mypressonline.com/tb_meningitis_guidelines_2020.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/voyager_legend_cs_b335_system_bluetooth_lat.pdfIn PDF document text
    • http://1xbets-reg.site/16425038186yf117.pdfIn PDF document text
    • http://tobufupevujuma.mygamesonline.org/is_wendys_spicy_chicken_salad_healthy.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/gakunuraxo.pdfIn PDF document text
    • https://rejifiri.weebly.com/uploads/1/3/1/3/131380436/4217121.pdfIn PDF document text
    • http://azalea.store/rene_guenon_englishoh1dw.pdfIn PDF document text
    • https://malosana.weebly.com/uploads/1/3/5/3/135323031/puwesefewosuf-kajom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6d24a03-9031-44d4-865b-705e6ef0c809/66046824064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c0bd91e-3f1f-4d99-963d-313818477691/how_to_fix_epson_l360_not_printing.pdfIn PDF document text
    • http://salajire.onlinewebshop.net/random_walk_brownian_motion.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_off0000f3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B4 5500 bytes
SHA-256: a05a7b9b9385c25bf887a19faa736a4b2d18804f5419f2646d4df68a3a76c294
font_01_sfnt_off00010671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 11004 bytes
SHA-256: 1e3d9c0370af997db5290208d111cd3ab59495509a90b3fa58e073ff9bc487fc

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