Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c41eac72f83d89…

MALICIOUS

PDF

82.5 KB Created: 2021-03-02 16:04:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: efd4ad0252662cb2d62a6d5abd75754f SHA-1: 4b59919c968dc392464eeafd6555a6b67b648eb6 SHA-256: 09c41eac72f83d890d42eb8e0f839eb2b286a1a20bc8c0f7ef507636dcc9e0b4
166 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous PDF files hosted on disposable domains, a common tactic for phishing and malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to open a password-protected archive, suggesting a multi-stage attack where the actual payload is hidden. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://vilenefex.ru/award?keyword=ihome+ibt230+set+date PDF link annotation
    • http://zoomita.space/almanak_2019m953e.pdfIn PDF document text
    • http://kulinar2020.site/mopifowikuzapesezhfume.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373985/normal_5ffd625f30cc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393776/normal_603325440d8cb.pdfIn PDF document text
    • https://nobexuliga.weebly.com/uploads/1/3/1/4/131405940/navazubojexikejazu.pdfIn PDF document text
    • https://mirexoxufi.weebly.com/uploads/1/3/0/9/130969656/a8004.pdfIn PDF document text
    • http://svoydvalend.xyz/41999628516i91at.pdfIn PDF document text
    • http://dronextactical.xyz/respondent_answerer5foi2.pdfIn PDF document text
    • https://tamusibexo.weebly.com/uploads/1/3/5/9/135966636/1261895.pdfIn PDF document text
    • http://mnogolidov.xyz/jizobobubotudupesacur56.pdfIn PDF document text
    • http://doucheapp.xyz/certified_ethical_hacking_course_in_indiaz1lr9.pdfIn PDF document text
    • http://marketeuro.pro/xiaomi_vacuum_cleaner_manualq81m2.pdfIn PDF document text
    • http://prolac.ru/asterix_and_obelix_meet_cleopatra_parents_guide7fulw.pdfIn PDF document text
    • https://nepazumikad.weebly.com/uploads/1/3/5/9/135958915/6c459.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388428/normal_60014136859ea.pdfIn PDF document text
    • http://vekvelo.ru/the_stranger_book_review_new_york_timesdz92p.pdfIn PDF document text
    • http://masito.space/wedozobelotamadigoh.pdfIn PDF document text
    • http://mon-cmso.best/sarcoidosis_skin_lesions_treatmentlc4p0.pdfIn PDF document text
    • http://lastmarkt.ru/jixugopowejmc0nz.pdfIn PDF document text
    • http://tdsevsvet.ru/whirlpool_duet_sport_ht_door_seal46pcl.pdfIn PDF document text
    • http://hamlikjorettoop.ru/my_pet_animal_rabbit_essay_in_englishl2jck.pdfIn PDF document text
    • http://alcexpress1.xyz/how_many_miles_do_navy_seals_runip7x7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5B 3352 bytes
SHA-256: 91c30e2d1ada78d216450f988df81a9b8af68f06a1eabed5d87816fe5ae9965c
font_01_sfnt_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 5452 bytes
SHA-256: 86154d2c698a3559855872e5906cfbef7a5ac48a7db02d80fbe9630ebafab352
font_02_sfnt_off00010caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAF 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_03_sfnt_off0001153c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153C 11024 bytes
SHA-256: 83e4acba22ec9e6e9d59b292e8104207c15f77311b9ed48724631aff22b75366