Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ff353bd6d251b5…

MALICIOUS

PDF

73.1 KB Created: 2021-04-05 16:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6cc179e5ac14057719dacaa388b11b8 SHA-1: ac7f98d6a3e569ea8063c79252c672038b91c2b9 SHA-256: 71ff353bd6d251b5a8bf9228420cd643a73a2c458ba03211096c8cefc8f2fe76
104 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs and a heuristic for a download button suggests a phishing or social engineering attack. Although no scripts were explicitly extracted, the PDF format can embed JavaScript, which is often used to download secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://bologen.ru/award?keyword=ssc+adda+computer+capsule+pdf
    • http://maxirem.mygamesonline.org/cognitive_biases_poster.pdf
    • https://burogoga.weebly.com/uploads/1/3/2/7/132740280/vozejigelosumaruxo.pdf
    • https://cdn.sqhk.co/pujazojiwixi/NAPhjGN/rajibupufotix.pdf
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/adce443fcb7ff2.pdf
    • https://jobeluraxofedir.weebly.com/uploads/1/3/4/3/134317239/8749709.pdf
    • https://mepovokure.weebly.com/uploads/1/3/0/9/130969824/benopadom.pdf
    • http://legko.travel/tolulokavovurafixobep9sgwm.pdf
    • http://bukuxojunuz.mypressonline.com/actus_hominis_dan_actus_humanus.pdf
    • http://bathforlegs.xyz/ruzokegupedzteqh.pdf
    • http://axecheat9.xyz/analytical_skills_behavioral_interview_questions_and_answerstc0t7.pdf
    • https://cdn.sqhk.co/mitugejaxel/9tjdhfo/world_war_heroes_mod_apk.pdf
    • https://cdn.sqhk.co/disumuneriva/LgegcLc/how_to_make_origami_animals_and_birds.pdf
    • https://cdn.sqhk.co/mawejoxejobe/ihcVBii/70813693662.pdf
    • https://wagoburaf.weebly.com/uploads/1/3/4/5/134524365/wadejipip.pdf
    • http://discount50it.pro/790428250235eif5.pdf
    • https://cdn.sqhk.co/zeboxuze/hiVUhgy/sexusefosodedopa.pdf
    • https://mekuzawejonoma.weebly.com/uploads/1/3/1/6/131606345/karaxedumi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/betefowubevat/graco_nautilus_80_elite_manual.pdf
    • https://s3.amazonaws.com/mekonulegipero/world_human_development_report_2017.pdf
    • http://zakefuki.myartsonline.com/mebopebusapanuxinavisagum.pdf
    • https://s3.amazonaws.com/wewiro/lujomepevesodekuwusaj.pdf
    • http://famomijis.onlinewebshop.net/apics_certification.pdf
    • http://merovuditipin.onlinewebshop.net/saurastra_samachar_bhavnagar_download_today.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_off0000dfa9.bin
de936c5751a6be562983ca57a738f3cef012b4977b22466137e559fb28fd8d05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA9 5404 bytes
font_01_sfnt_off0000f1f3.bin
32b4971289993438185fb602a06b5ea4fc01798d12d9647dad9e18f1531f8bf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 10964 bytes

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