Malicious PDF — malware analysis report

Static analysis result for SHA-256 16cfcc027598779b…

MALICIOUS

PDF

87.9 KB Created: 2021-05-16 17:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8df8019ffd80ba7e8121ae69af1c7e15 SHA-1: 27e8ce829c744db222eb7c4d5c4e96ec114f6620 SHA-256: 16cfcc027598779be49fdcea2860f0a7f42a87a529dbe7b3f556237bf67415cb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, suggests a lure related to a 'Samsung galaxy a2 core wifi problem', aiming to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=samsung+galaxy+a2+core+wifi+problem PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494866/normal_605ac94d9a0d4.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/ggRstqi/zasuki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451035/normal_5fdc6989b7c37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448110/normal_602ceec42722e.pdfIn PDF document text
    • https://cdn.sqhk.co/pegebatanuz/RZaZ0Qt/acero_inoxidable_material_compuesto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421637/normal_606a82ac1f157.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/xibhjgg/lions_running_back_history.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489061/normal_5fcca9929dea7.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/26988645237.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/iYhfDhc/slice_factory_chicago.pdfIn PDF document text
    • https://cdn.sqhk.co/niporatibu/rhe3gdm/green_papaya_fort_smith_arkansas_menu.pdfIn PDF document text
    • http://dawezedelofeda.scienceontheweb.net/air_conditioning_system_design_roger_legg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473035/normal_60542dc2b2d08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454971/normal_5feafb21cbbdc.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/JSgcYBe/dilaxasif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451356/normal_5fcf60fe69b15.pdfIn PDF document text
    • http://vuwiwetidajin.mywebcommunity.org/93474066156.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopiroxab/0hjhigc/pevovazuwidelur.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/gihfiia/78417222868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471474/normal_6012f87d52fff.pdfIn PDF document text
    • http://vofufime.mypressonline.com/bosch_300_series_ventless_washer_and_dryer.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/iffigjf/uphill_rush_water_park_racing_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fukurem.epizy.com/rawemibofofokalako.pdfIn PDF document text
    • http://kexeban.rf.gd/dofuvaduzebidezekutenu.pdfIn PDF document text
    • http://ledufowi.myartsonline.com/antepartum_fetal_monitoring.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_off00011938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11938 5972 bytes
SHA-256: 94accc73516014f667bfe06f5537bbcc768f6f21c7e8b44dcef5a245172b318c
font_01_sfnt_off00012d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D92 10700 bytes
SHA-256: 4250da467da553341b31819044d0a7cfcd1ab423238fd2d8ca74817e0452d6cd

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