Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc0f82a6ac8673b…

MALICIOUS

PDF

85.3 KB Created: 2021-05-02 23:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 947c9a1ee011c901ee4c92b0ed30f673 SHA-1: 75e5e8cea3171fe12bc44edede107da150db7c8a SHA-256: edc0f82a6ac8673b21ae605bf146390944f53ae68c7eebb285e5e343ffe22bbf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to documents with numeric or generic slugs, indicative of a link farm for SEO manipulation or phishing. One prominent URL, 'https://resalured.ru/strik?utm_term=how+much+can+rent+stabilized+apartments+increase+nyc', suggests a lure related to rent stabilization. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=how+much+can+rent+stabilized+apartments+increase+nyc
    • https://cdn-cms.f-static.net/uploads/4418170/normal_6018616cd626f.pdf
    • http://visiblawty.com/109672615033fkm8.pdf
    • http://ijmalan.xyz/lelipuxao55z.pdf
    • https://cdn.sqhk.co/gixelotopa/hciajc5/9537805394.pdf
    • https://cdn.sqhk.co/lulufebexefe/sejcBeA/ragdoll_fall_guys.pdf
    • http://sexedate69.site/88834954576xbqax.pdf
    • https://cdn-cms.f-static.net/uploads/4365636/normal_603942a900c33.pdf
    • https://cdn-cms.f-static.net/uploads/4374708/normal_6025e09916d56.pdf
    • http://indonesia2health.online/bujuwur56l.pdf
    • https://cdn-cms.f-static.net/uploads/4423453/normal_6067b89059735.pdf
    • https://cdn.sqhk.co/pinofizulag/ghfOIie/national_geographic_channel_on_directv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xojafemori/academic_medicine_authorship_guidelines.pdf
    • https://s3.amazonaws.com/metubevozisul/zufugu.pdf
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_8dd7e2e65ae54c39acc2b5966dcc2737.pdf?index=true
    • https://s3.amazonaws.com/wexukufedepim/wifi_bandwidth_manager_android.pdf
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_f74f362b756048c1aa55f5ea00d5c484.pdf?index=true
    • https://s3.amazonaws.com/gowebabuxogiro/dsc_power_832_user_guide.pdf
    • https://s3.amazonaws.com/lomogas/android_auto_ford_sync_3_bluetooth.pdf
    • https://s3.amazonaws.com/varolexexus/27060773604.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e33.bin
34ad20dacaf31e32c88f400c91c1a3efb1ee22ce60157eac53dfc6f634e2ce6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E33 5656 bytes
font_01_sfnt_off00012159.bin
4cca1ec9e6a98adf1949a416791f45185c4881c8b3aa189a69cf09496b738226		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12159 11220 bytes

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