Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2fcd6d532d6ef8…

MALICIOUS

PDF

91.8 KB Created: 2021-04-06 18:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 816c240f9c3b41324ab2120b32a22822 SHA-1: 6e9e4053e553ecf489337c1068e1cd1b57908599 SHA-256: 4b2fcd6d532d6ef8d4b5c8abc224fa0c9575c685d774f43b353565f295a4c6ae
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. One of the primary indicators is the URL https://xezojetit.ru/123?utm_term=kgmu+b.+sc+nursing+form+2019, which is presented in the document body and flagged by heuristics as an external URI. The document's structure and the presence of multiple disposable hosting links suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://xezojetit.ru/123?utm_term=kgmu+b.+sc+nursing+form+2019 PDF link annotation
    • http://nefetenebubuwid.iblogger.org/xudeviduxiduxo.pdfIn PDF document text
    • http://faketikus.22web.org/wajenawoguzogepataxer.pdfIn PDF document text
    • https://mogewojelepa.weebly.com/uploads/1/3/4/6/134681452/kizegiw-bobapagawixago-nevibasevezizuz-sokuli.pdfIn PDF document text
    • https://lovivusopeme.weebly.com/uploads/1/3/6/0/136095788/jebejotowiril.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/jjcOpaG/.pdfIn PDF document text
    • http://kopolebukerone.iblogger.org/53473562655.pdfIn PDF document text
    • https://lusogovo.weebly.com/uploads/1/3/4/3/134358567/9612058.pdfIn PDF document text
    • https://cdn.sqhk.co/zujomawa/VylAZje/kozerabizerobo.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/ggjcK4v/worm_snake_io_tips_2020_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/hjgV1to/92677391526.pdfIn PDF document text
    • https://cdn.sqhk.co/vovomafejuwa/igif3V9/ponavatepareri.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
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_429869df9bf84255968b5b341a8b02d4.pdf?index=trueIn PDF document text
    • http://modenizax.epizy.com/tekin_rsx_pro_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e34795bf-ad70-4061-b39b-5d8b38784d9e/294289363.pdfIn PDF document text
    • http://vabizawez.epizy.com/audio_cutter_and_joiner_app_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5738efe9-8ffc-47ed-a90c-c1cd275936ad/kubufegikinijafoku.pdfIn PDF document text
    • http://kisitibonadal.rf.gd/sexolugiwatunugal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3fc4d01-4edd-480f-b4f8-fd2a17075511/pelonis_1500-watt_ceramic_tower_electric_space_heater_reviews.pdfIn PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_a7e60fedf1454a52a51ca5affdc10251.pdf?index=trueIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_a2954d56b75c4283a81745da4abd9748.pdf?index=trueIn PDF document text
    • http://dijuforuzukogem.rf.gd/cd4017_circuits.pdfIn PDF document text
    • http://pixawobizazixe.rf.gd/supercapacitors_101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79bfc462-b764-4093-83ad-c1a54807471e/38639098553.pdfIn PDF document text
    • http://xinudigiwuwa.epizy.com/fixorowenamuvogidasakola.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF74 5264 bytes
SHA-256: 6aa4600a5d275427ae28b278f401d640f907bb2224ca36468345d8dae186b72d
font_01_sfnt_off0001114b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114B 13260 bytes
SHA-256: d9ae9cd23261069b2990f057a3df805b2929ef7b8abea2aa373dc0bb62975ec9
font_02_sfnt_off00013c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C69 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8
font_03_sfnt_off00015182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15182 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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