Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4b52e9bebd2d40…

MALICIOUS

PDF

91.6 KB Created: 2021-03-19 07:34:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9089987379d231c91514b33666a6b386 SHA-1: 01df576515c7f1d9c7af378fdc26fa262fdaeffd SHA-256: cc4b52e9bebd2d4027eaf3929c1213f855520dbd031ecf0de0e68a2235fd13fc
164 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 are hosted on dynamic DNS services or free hosting platforms, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=kerala+psc+malayalam+questions+and+answers
    • https://cdn.sqhk.co/fopeziriga/gjhgchc/hero_xtreme_bike_price_in_bd.pdf
    • https://cdn.sqhk.co/livatunozasu/o21eUgd/famous_sculpture_artists_modern.pdf
    • https://rilavowa.weebly.com/uploads/1/3/2/7/132740415/0e0fa293.pdf
    • https://cdn.sqhk.co/rapawomo/ihIjhii/33274480754.pdf
    • http://kuviruvada.getenjoyment.net/aprender_ingles_intermedio.pdf
    • http://tixesikixux.mygamesonline.org/27632029672.pdf
    • https://cdn.sqhk.co/padasagam/Tdaheie/933091326.pdf
    • https://luboguti.weebly.com/uploads/1/3/0/7/130739177/sutip.pdf
    • http://dofuluxaruze.22web.org/classic_wow_leveling_guide_mage.pdf
    • https://lamuwibosuzo.weebly.com/uploads/1/3/1/0/131071033/3134132ce.pdf
    • https://cdn.sqhk.co/tawunipufop/hdhclGP/halloween_costumes_2020_kids.pdf
    • https://cdn.sqhk.co/seponidozit/Ehj8hhk/jozimifumibexifaperosej.pdf
    • https://cdn.sqhk.co/dudofolejune/fgegcAy/hard_riddles_with_simple_answers_in_spanish.pdf
    • https://cdn.sqhk.co/sodelaranu/hzgdGDn/womens_tank_tops_jumpers.pdf
    • https://cdn.sqhk.co/miviluwulux/ijhchdZ/17918946597.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102Hussain
    • http://smc.org.inhttp://smc.org.in
    • http://www.daltonmaag.com/
    • http://venakato.epizy.com/mutexaleputulodapevose.pdf
    • http://kinuvafarugabob.rf.gd/digital_electronics_book_free.pdf
    • http://vaxomuterok.epizy.com/reconciliation_action_plan_template_for_early_childhood.pdf
    • http://tuxabatadifu.onlinewebshop.net/479004623.pdf
    • http://sitotozip.rf.gd/vcenter_server_appliance_install_guide.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
    • https://gitlab.com/smc/meera/blob/master/COPYING

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104c6.bin
a0655f9afafc02252862c8c36b720dcdaa131718ef4331fa50efb57adb850c5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104C6 5392 bytes
font_01_sfnt_off00011706.bin
e3574e5929501f862ad14770809f01cf857429ea0a8864dcdeeecc285e917e17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11706 5144 bytes
font_02_sfnt_off000129f9.bin
2365a14678c44d2b3883a58d6072c7d32c5f0e479d7d11a148875a664457c112		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129F9 11340 bytes
font_03_sfnt_off0001509f.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1509F 4324 bytes

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