Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ba3386eeddf73f…

MALICIOUS

PDF

81.5 KB Created: 2021-04-27 01:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 6d1837cd0142f9c701a5f919feba7557 SHA-1: 5fc0ae98c22523eff544064cd4d1bf31aa2a7f84 SHA-256: 83ba3386eeddf73f2250fa0962d2dfb2aa4bd78585210b24616010963ad9bb58
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 heuristics as a link farm and by ML classifiers as malicious. The ClamAV detection confirms its malicious nature. The primary malicious URL identified is https://seumenha.ru/strik?utm_term=brown+bear+brown+bear+printables+mini+books, which is likely used to redirect the user to a phishing or malware distribution site.

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://seumenha.ru/strik?utm_term=brown+bear+brown+bear+printables+mini+books PDF link annotation
    • http://menformula.xyz/insinkerator_badger_500_1_2_hp_continuous_feed_garbage_disposal_with_power_cordi6679.pdfIn PDF document text
    • https://cdn.sqhk.co/wogirujut/davheUt/dps_student_portal_detroit.pdfIn PDF document text
    • http://onenature.space/learning_spanish_like_crazy5en0f.pdfIn PDF document text
    • http://geserixok.22web.org/xevekexamobebexijul.pdfIn PDF document text
    • http://xogunajeraxuda.mywebcommunity.org/how_to_calm_a_gsp_puppy.pdfIn PDF document text
    • https://cdn.sqhk.co/totudavomud/aIgcddz/poloxolulox.pdfIn PDF document text
    • http://storeplus.info/skyward_gisd_gonzales5kqpu.pdfIn PDF document text
    • http://vonomejiri.iblogger.org/2101791451.pdfIn PDF document text
    • http://zuregazezoral.mygamesonline.org/85310985394.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/cch_chuyn_t_nh_sang.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://xepalufozakot.epizy.com/formas_de_preparar_chorizos_parrilleros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b44b1f2-4c79-40c4-9bb8-8442853c2965/zajatufapetuwiwebugikinij.pdfIn PDF document text
    • http://bazimiguzanuv.rf.gd/additive_manufacturing_seminar_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c632f2a-c5f7-4a85-b74b-e5ab39a9263c/how_to_ease_public_speaking_anxiety.pdfIn PDF document text
    • http://xoxuzawezumeb.epizy.com/x_and_y_axis_graph_paper.pdfIn PDF document text
    • http://giwofigu.epizy.com/47697371867.pdfIn PDF document text
    • http://kixasudasiwub.epizy.com/mabazakogivadozati.pdfIn PDF document text
    • http://nibatozov.epizy.com/nuzosutugogir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f655847-c9f0-4504-aeb0-d8ea8de3c756/31647961925.pdfIn PDF document text
    • http://fijumusuxolegoj.atwebpages.com/anlauttabelle_zebra.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_off0000f261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF261 5096 bytes
SHA-256: 63f236fdf2f1e9047f9257688f86795f88c29631361ec18ea4c9669bcc790100
font_01_sfnt_off0001039c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 11712 bytes
SHA-256: 6bc4a312cf4b83c2e0a3152d8a55b37fdc276c8a93c4647f0cfb47aa22b4dd78
font_02_sfnt_off00012a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A42 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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