Malicious PDF — malware analysis report

Static analysis result for SHA-256 5083cd9a85473a87…

MALICIOUS

PDF

71.7 KB Created: 2021-03-06 17:53:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8610ca69eeba77cd11c8830f649eedee SHA-1: c994fdf410105d0418a734396892372761678857 SHA-256: 5083cd9a85473a877d28b3d85c0fd5b0e28760809f998d33cf1545a7deff0615
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to disposable hosting and potentially malicious domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed as a link farm.

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://soxebez.ru/aws?utm_term=is+a+health+information+technology+degree+worth+it PDF link annotation
    • http://mamafiposorugul.sportsontheweb.net/tumupimazugapelesobaraj.pdfIn PDF document text
    • http://zupurowuzuxule.iblogger.org/69600214258.pdfIn PDF document text
    • http://suwefazimim.medianewsonline.com/netgear_gs108ev3_specs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471688/normal_5fe4662caa064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445532/normal_60199139ae2f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417537/normal_6028106537cce.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/canon_mg3520_printer_cl_light.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475987/normal_5ffe53fa9116c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421460/normal_60216b8aa8a73.pdfIn PDF document text
    • http://lalashoppen.online/31716498220vzfz2.pdfIn PDF document text
    • http://mukumalatixuji.iblogger.org/belonubinunimora.pdfIn PDF document text
    • http://kluruu.info/carrier_infinity_thermostat_installation_manualoag9s.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://nojikigor.myartsonline.com/use_a_geometric_formula_to_evaluate_the_integral_calculator.pdfIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_061ed60d6c964f17833858e8dd1962ae.pdf?index=trueIn PDF document text
    • http://xoxepilazif.rf.gd/lacassine_pool_fishing_report_2019.pdfIn PDF document text
    • http://bapomel.epizy.com/gonukimifenogofaw.pdfIn PDF document text
    • http://saxigadulul.rf.gd/batezukexirak.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_97d3fb0f9a8b4bcc90b78e6a786551a2.pdf?index=trueIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_b06a792caac14ab6996594ac7167dca6.pdf?index=trueIn PDF document text
    • http://luxupuxud.myartsonline.com/what_type_of_oil_for_briggs_and_stratton_push_mower.pdfIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_bfb8a8381e7541b69e0fcf871751fbdf.pdf?index=trueIn 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_off0000cfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBE 5356 bytes
SHA-256: a67f796e744d38ec21fe784bd72aeeb5a93370f915f81f498cec5d5d6def976a
font_01_sfnt_off0000e1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C5 9796 bytes
SHA-256: 4706a1ae14efbfd618fe6c9c0e1cc3a7e354e2985c644f6eed15ccd798bda04f
font_02_sfnt_off00010300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10300 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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