Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c7669c6842a027…

MALICIOUS

PDF

92.5 KB Created: 2021-02-21 16:53:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9ce12b6090b6be8bfd7b80929a6ba6e8 SHA-1: 78dd751b67530370e1530ed2f45575416abc187f SHA-256: e4c7669c6842a0279f23263f597c2a9f1acaf4e92608f2ba0174e9b59f368fff
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous unknown reputation URLs support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/wix?keyword=acnl+coffee+guide+kicks PDF link annotation
    • https://cdn.sqhk.co/sedazozesufu/EhcEif1/piliwalugukubiteg.pdfIn PDF document text
    • http://livitopav.22web.org/how_to_use_zavor_duo_pressure_cooker.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/YgiiiwX/goddess_kiss_pilots.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/gjeighi/transmission_jack_adapter.pdfIn PDF document text
    • https://cdn.sqhk.co/nolovojawek/aAyvihK/lerilawug.pdfIn PDF document text
    • https://mefuwowenapes.weebly.com/uploads/1/3/4/6/134611128/fafafuzapumu.pdfIn PDF document text
    • https://cdn.sqhk.co/wexovezojab/Hrhdnif/weather_forecast_for_today_in_my_location.pdfIn PDF document text
    • https://cdn.sqhk.co/jezofadu/RyGzgd6/nitro_powered_rc_boats_for_sale.pdfIn PDF document text
    • http://banuzatama.22web.org/74202773582.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/hijbt6D/sovamazazukexavoruje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416928/normal_602ef0296752d.pdfIn PDF document text
    • https://xumijarivibamow.weebly.com/uploads/1/3/5/3/135339210/faluwo_getod_zerolow.pdfIn PDF document text
    • https://cdn.sqhk.co/supetuzitepi/jixjjhh/pet_paradise_resort_houston_texas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377401/normal_6005b231b2381.pdfIn PDF document text
    • https://xidokuwu.weebly.com/uploads/1/3/1/4/131453793/rutebaju-xonovegekelop-xiwepawibimevu-kugujibob.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://xatosizukav.epizy.com/lazewoxukov.pdfIn PDF document text
    • http://gepikadagutuv.epizy.com/banaribu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF725 10824 bytes
SHA-256: 81f2b80c2b2a8ca0d36eaf05ec1ec5b35692964c835f14e3a126463fea2ac337
font_01_sfnt_off00011b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B12 4736 bytes
SHA-256: 404984553e81b5def840ed352ac0aea2b41b777353334cf2b3caea3153c011d5
font_02_sfnt_off00012b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3D 13844 bytes
SHA-256: 585299609b79639bd6b13120775b51f0d8fe46fb48fa405ace28a24a8d3b6d0f
font_03_sfnt_off0001566d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1566D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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