Malicious PDF — malware analysis report

Static analysis result for SHA-256 9570d33b00dc628a…

MALICIOUS

PDF

116.6 KB Created: 2021-03-23 22:37:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddd367a9fd099866ab43a51ea3ef4bb3 SHA-1: d5e165f9f5bc02dec6eed1099ee6fb5b7f22b5a9 SHA-256: 9570d33b00dc628aabacae0442cc0f4e0c70d874cdb13cfe05aebaa05e02b45f
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains heuristics indicating it is malicious, including a high ML score and ClamAV detection as a phishing trojan. The embedded URL points to a suspicious domain, and the document body, though obfuscated, suggests a lure related to 'quiz answers' and potentially urgency. This indicates an attempt to trick the user into clicking a malicious link to download further content.

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://golowaki.ru/wix?keyword=econ+545+quiz+2+answers+pdf
    • https://cdn-cms.f-static.net/uploads/4407998/normal_6045089485c8d.pdf
    • https://cdn-cms.f-static.net/uploads/4414871/normal_6029e1ec003fe.pdf
    • https://static.s123-cdn-static.com/uploads/4428035/normal_5fef0ca2a9f88.pdf
    • http://mattelipsticks.site/40406458691qt0hz.pdf
    • https://cdn-cms.f-static.net/uploads/4411701/normal_60190bd7b387f.pdf
    • https://cdn-cms.f-static.net/uploads/4445881/normal_5fdbe11bcb125.pdf
    • https://static.s123-cdn-static.com/uploads/4459631/normal_5feecba4b8f10.pdf
    • http://swiss-gear.shop/puvaxojizetiapnic.pdf
    • https://cdn-cms.f-static.net/uploads/4476566/normal_600c9e41a4690.pdf
    • https://cdn-cms.f-static.net/uploads/4375352/normal_6012f96000565.pdf
    • http://carins.info/73034452544pfc9u.pdf
    • https://static.s123-cdn-static.com/uploads/4409243/normal_5ff869c562005.pdf
    • https://cdn-cms.f-static.net/uploads/4465125/normal_601db0a51ce84.pdf
    • https://static.s123-cdn-static.com/uploads/4422368/normal_60069e7002735.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jivala/32612572673.pdf
    • https://s3.amazonaws.com/muwemivumazulax/angielski_matura_podstawowa_gramatyka_wiczenia.pdf
    • https://s3.amazonaws.com/towakog/13522040732.pdf
    • https://s3.amazonaws.com/daniwodug/the_holy_quran_arabic_text_with_english_translation_and_commentary.pdf
    • https://s3.amazonaws.com/zizene/how_do_you_use_trx_at_home.pdf
    • https://s3.amazonaws.com/likadojivivofu/39262716174.pdf
    • https://s3.amazonaws.com/ladiwuzetawedi/mibowisedevagagur.pdf
    • https://s3.amazonaws.com/tenunud/piriformis_muscle_injury_symptoms.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_off00018fac.bin
1134fe312985a8d395a16e8a5cd6f53f13174504df2a895a5dad75648bdec518		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18FAC 5684 bytes
font_01_sfnt_off0001a345.bin
2404688ce320f247d3c39d8178bdc9151aa34b30ed555f18c7b9a11fb79e83ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A345 9824 bytes

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