Malicious PDF — malware analysis report

Static analysis result for SHA-256 922e08a5932d4fad…

MALICIOUS

PDF

77.9 KB Created: 2021-04-18 20:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 11ad52aeba138fecc7f0d81b2420868e SHA-1: 27e8e8931d6eca3bc208957adb8de2871069dfa0 SHA-256: 922e08a5932d4fadfb1783386424a7f48aa915352d7336e2866f645d988a920a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with a primary URL pointing to a site that appears to be a lure for search engine optimization. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to decoding a Honda VIN number, suggesting a pretext for directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=how+do+you+decode+a+honda+vin+number PDF link annotation
    • https://jebezowurexa.weebly.com/uploads/1/3/4/5/134576847/7926300.pdfIn PDF document text
    • http://qrastenmap.online/clasificacin_de_funciones_ejemplosj5k5e.pdfIn PDF document text
    • https://fenawivo.weebly.com/uploads/1/3/4/0/134000055/mubamaka-pekapuluwoso-wufon-ruxen.pdfIn PDF document text
    • http://itasda.online/nejiladusiz5yqrq.pdfIn PDF document text
    • http://vuvotutavaxoli.iblogger.org/baby_rudin_chapter_3_solutions.pdfIn PDF document text
    • http://mutodute.22web.org/zujomakub.pdfIn PDF document text
    • https://nabinavupofi.weebly.com/uploads/1/3/5/3/135350319/88b052b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491153/normal_603e17b316705.pdfIn PDF document text
    • http://smotrikino.fun/basic_english_worksheets_for_grade_1_grammarma5uq.pdfIn PDF document text
    • https://gelupolo.weebly.com/uploads/1/3/5/3/135314506/virexes_rovijubafise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401538/normal_601495a8e4627.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_794a86be701646bb8fb3de8cfc2126d1.pdf?index=trueIn PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_49561bdc4ef447aeb7df8c8c61514c51.pdf?index=trueIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_93887ba848664371816ece15c159a90a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/heterogeneous_catalyst_chemguide.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/netlink_trust_annual_report_2017.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_a358767f7939485387b04996cde9b550.pdf?index=trueIn PDF document text
    • http://vakakumiwizexoj.epizy.com/fovotumawakamus.pdfIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_294c0d009ac5404394d06fce11cb5799.pdf?index=trueIn PDF document text
    • http://tuvatopuvonu.epizy.com/kebewavi.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/14586049905.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/194943897.pdfIn PDF document text
    • http://nunusama.rf.gd/angulos_en_la_circunferencia_formulas.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_off0000f287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF287 5324 bytes
SHA-256: ff62edf707526dc51ac714d493f4ea5ad1964522c75d848b6c4e345f08066ce3
font_01_sfnt_off00010493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10493 11040 bytes
SHA-256: 0d6d31bf4097bb89cce4087769febc1ee78242b936bf92df265e091b71b08c58