Malicious PDF — malware analysis report

Static analysis result for SHA-256 5288403051e8e4d4…

MALICIOUS

PDF

74.8 KB Created: 2021-04-05 09:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0157d2c8ad556c764d2d85cfa4cc850d SHA-1: c64838d95d65c5fb8249ab760e5f9d7cd52a1599 SHA-256: 5288403051e8e4d41008e98f9d7e20db122519591cffd4efb2da0ae998b71608
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware delivery attempt. It contains multiple suspicious links to external domains, including one explicitly flagged as an 'invisible link to suspicious domain'. The document body, though heavily obfuscated, suggests a lure related to maps or guides, which is a common tactic for phishing campaigns. No scripts were extracted, but the presence of external links and the nature of the heuristics strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://midufefew.ru/award?keyword=bhosari+midc+map+pdf PDF link annotation
    • http://avbox.org/wasixejubokofibiwogiliximnu0a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385424/normal_604ad99721c4c.pdfIn PDF document text
    • http://baranaydin.org/fishman_sa220_vs_bose_l1p7s00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451365/normal_603caeb9adcb2.pdfIn PDF document text
    • http://tirudibemaj.22web.org/kevopemi.pdfIn PDF document text
    • http://byt-upak.ru/best_magnetic_stripe_reader_writervpc43.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/1Hgg5ia/linawej.pdfIn PDF document text
    • http://idealsit.fun/free_online_health_and_safety_training_for_schoolskux42.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://puzezaxu.22web.org/object_oriented_programming_java_final_exam.pdfIn PDF document text
    • http://shtangye.xyz/how_to_change_name_on_nec_dsx_phonel5mmt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405206/normal_6006664539438.pdfIn PDF document text
    • http://rollernefrit.xyz/68939919276wz2jo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482858/normal_602c28733bac7.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/how_many_years_course_is_ethical_hacking74ynh.pdfIn PDF document text
    • https://cdn.sqhk.co/fazituku/e4hfk7V/26999282956.pdfIn PDF document text
    • http://reduslim-siteofficial.site/how_to_light_a_heat-n-glo_pilotf1ryx.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/igNhgDk/kikaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://davobob.rf.gd/soft_contact_lens_fitting_guide.pdfIn PDF document text
    • http://lekinip.epizy.com/rurosomejipufavixa.pdfIn PDF document text
    • http://susebuxusebug.epizy.com/employment_contract_lawyer_cost.pdfIn PDF document text
    • http://dipomik.epizy.com/biohazard_waste_disposal_guidelines_uk.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_off0000e7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D2 5412 bytes
SHA-256: a03e24d032a531d5e69c7db42b4acf52cb1ccb281164dd0dfb6a5e7d5884a30c
font_01_sfnt_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 10316 bytes
SHA-256: 577e6961b715803a250f6699fe5c681a7870a8b29d1114ec0e3a334e0723f0bf