Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c14e7ff437fce2…

MALICIOUS

PDF

78.9 KB Created: 2021-05-20 11:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b7dbc014557bd8beef2b1cd6eab2600c SHA-1: c99f758a156405a790d593c76b3068cd58596617 SHA-256: 37c14e7ff437fce28d2605961206dd104610e83b1948c6aed9314ae05b9b7529
216 Risk Score

Malware Insights

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

The PDF contains obfuscated text that appears to be a lure related to financial transactions, specifically 'Como tirar dinheiro do picpay no banco 24 horas'. It also contains numerous external links, with one prominent link pointing to a suspicious domain 'midufefew.ru'. The presence of PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS heuristics, along with ClamAV detection, strongly indicates malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/strik?utm_term=como+tirar+dinheiro+do+picpay+no+banco+24+horas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383797/normal_60567d5813804.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459777/normal_5ff60ea489326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482636/normal_5fea272e33a85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475565/normal_600e955e41367.pdfIn PDF document text
    • https://divupamafotot.weebly.com/uploads/1/3/0/7/130739309/a94293cb35a.pdfIn PDF document text
    • https://juzajepilokak.weebly.com/uploads/1/3/4/6/134682244/85781bd9.pdfIn PDF document text
    • https://wufovepujiz.weebly.com/uploads/1/3/0/7/130775368/zefukokuvil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379722/normal_6049d630b508d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff9b0812-91ee-47e4-8816-61a35f3de5a2/titanic_musical_script.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/5498283446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae18063f-c411-4695-89d8-73d9a21468f0/the_art_of_power_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7c9cf6a-6e04-48d6-90e4-489c581f5aa7/dasimeforunafejus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33aa07a4-03fb-4d5b-8c01-03898b1a9609/how_to_draw_cartoons_step_by_step_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4e57b46-9d7a-4920-ae86-200a322931fb/mixed_strategy_nash_equilibrium_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec801ef8-d672-4103-af21-40abc23e507d/private_practice_season_5_episode_19_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e4018f8-6cf6-44ef-8c00-d53206a721b1/how_to_reset_h264_dvr_using_password_generator_software_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c10f09d-bcc3-4359-9b76-9b4065a6205c/zabewatotevaparo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a9ab9d8-ed9b-4bbc-b381-20fa532f92fa/bubekulededizapuz.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/lumugiwunalenasumukugebeg.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/zuwimikobakapumugotir.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/nulenepujukinofisabuvufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c572529-a9b1-41d4-847f-22a6508e1465/12231384478.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 5648 bytes
SHA-256: 1cf20495d9048d7984c35153f46f13a8ea511de35a8025c7a5f6f3e660021bcc
font_01_sfnt_off00010413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10413 13080 bytes
SHA-256: 3516e54612d1378c02d92ff49d25b856cb8dfa1a4efa9dc26094ffd3db7b3a58