Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6c93f51ab5665e…

MALICIOUS

PDF

90.5 KB Created: 2021-04-01 06:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d7152c084fb713267899d6db1877843 SHA-1: e4593ad9858cc1f7f18429c1f7dbfe5867053c5c SHA-256: 7b6c93f51ab5665ea9c5784ca555ab90eac0bdc549ab1bc3cbc300b92db6b059
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to a domain that appears to be a lure for a 'DNA replication worksheet', suggesting a social engineering tactic to trick users into downloading further malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://mezovuduw.ru/wix?keyword=dna+replication+worksheet+high+school
    • http://manibupefif.mypressonline.com/zulagixe.pdf
    • http://bijowuxupolapi.sportsontheweb.net/el_almohadon_de_plumas_libro_completo.pdf
    • http://rakajipof.22web.org/bypass_proxy_android_mobile.pdf
    • https://cdn.sqhk.co/bomemenun/gghbYgd/md_anderson_cancer_center_scientology.pdf
    • https://cdn.sqhk.co/noluxokeruma/wMFggFr/80852858295.pdf
    • https://cdn.sqhk.co/buvaboda/kIf10hg/metal_slug_7_nintendo_switch.pdf
    • https://cdn.sqhk.co/jokawefezo/eijhgQP/pajexowobeg.pdf
    • https://cdn.sqhk.co/xoraxuvonaf/wiekhjQ/lerepuloxopomep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8994dc82-3839-475c-8de5-8afaa5c13229.filesusr.com/ugd/798b5e_74191850e2854df494811b86ffdf8092.pdf?index=true
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_59fbd310d1ba41c6acb1b07e4f7fa913.pdf?index=true
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_5f0e681e721248fe95a88ed6c294c2de.pdf?index=true
    • https://s3.amazonaws.com/gapivegek/xixebinisapitepoze.pdf
    • https://s3.amazonaws.com/bamepofewalada/ca_2018_insider_threat_report.pdf
    • http://limuzanesaz.rf.gd/orthography_english.pdf
    • https://s3.amazonaws.com/juwofuxufijup/berglund_performing_arts_theater_seating_chart.pdf
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_ca27fede11d94ec39463289c1a5f31bd.pdf?index=true
    • http://mirivukavezigo.epizy.com/vivacious_in_a_sentence_yahoo_answers.pdf
    • http://purevaxa.epizy.com/segmentation_techniques_in_image_processing.pdf
    • https://s3.amazonaws.com/fulazelof/manualidades_de_otoo_con_rollos_de_papel.pdf
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_053e422271d04798b72574d5f60dbfa7.pdf?index=true
    • 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_off000121fc.bin
f029eb4fc5d3f4333cae0b225b051c9523d882f85b2231fbecf6250aee034021		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121FC 5352 bytes
font_01_sfnt_off00013443.bin
c4d256d9241fd4fa31fa8c4adf145c24d5be1f94625bbab63e7f91cf3452cd4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13443 12004 bytes

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