Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d55c5b0c3eb7716…

MALICIOUS

PDF

78.8 KB Created: 2021-03-03 06:50:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3928073cb2a6e798cebbe798cf1d0109 SHA-1: 0a93b6f06065f1fadf2dbf53ac20d4557388bdb4 SHA-256: 2d55c5b0c3eb77160e195c37e44ab8af00ce8661ade5a224c84ba37b5b2d0e1c
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It impersonates Microsoft and contains a call-to-action link pointing to `https://midufefew.ru/wix?keyword=snapchat+mod+apk+xda`, which does not match the impersonated brand. The presence of external URIs and the brand credential phishing heuristic strongly suggest this document is designed to trick users into visiting a malicious site, likely for credential theft or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://midufefew.ru/wix?keyword=snapchat+mod+apk+xda.
  • 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://midufefew.ru/wix?keyword=snapchat+mod+apk+xda PDF link annotation
    • http://xonigej.mypressonline.com/37866581870.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/72189790964.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/60162152576.pdfIn PDF document text
    • http://xamoxipuwizutux.scienceontheweb.net/what_is_chemosynthesis.pdfIn PDF document text
    • http://instas.site/dagurukw2jt.pdfIn PDF document text
    • http://snt-br.ru/78446284414t3ak8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418583/normal_6001d92a2ae1f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/formal_letter_writing_format_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/android_wear_or_wear_os.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/dothan_al_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/fotiviwapinuruliz.pdfIn PDF document text
    • http://japamitafixe.myartsonline.com/80907010864.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/medicinal_plants_list_and_their_uses.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/barif.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/tetogibowesabato.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/ielts_simulation_reading_test_9_answers.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 5244 bytes
SHA-256: 885266d29cc76df833707d747e1683ac707f5bcce9a57fc94de6396f289e68bf
font_01_sfnt_off0001002f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off000108bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 10428 bytes
SHA-256: 13a15882da00446216a304a94bacd07dc4eebc9d8a64899ec7b964875ec8b9c6

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