Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5847dffbb51237…

MALICIOUS

PDF

82.3 KB Created: 2021-04-01 06:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bdaaf8908765071ddd6d0bfbac5672e SHA-1: d80176c00f3f0ea101a918ab6ff792d6d2c1a814 SHA-256: 1d5847dffbb5123791b789af614e2ec6bb1651fe440b15f83acced355755eef1
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 URI pointing to 'nipisod.ru', which is highly suspicious. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/award?keyword=bfuhs+mbbs+syllabus+pdf
    • https://cdn.sqhk.co/kawinojos/dWieo8i/3668636435.pdf
    • http://purubifo.medianewsonline.com/tom_clancy_jack_ryan_season_2_date.pdf
    • https://xororawezajeber.weebly.com/uploads/1/3/5/3/135338150/miraxome.pdf
    • https://cdn.sqhk.co/foxenikap/hd0hbhj/simple_boat_bill_of_sale_template.pdf
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/sipudurexepononomix.pdf
    • http://akvatehnika74.ru/35136496357h5u06.pdf
    • http://gubuxuk.scienceontheweb.net/tipos_de_autolesion.pdf
    • https://xikofekukinakij.weebly.com/uploads/1/3/2/6/132681309/fdf6e5fefb.pdf
    • http://mastera-saydinga.ru/marlin_model_60_rifle_.22lr_review1for9.pdf
    • https://cdn.sqhk.co/buzovegom/4KFweha/python_formatter_online.pdf
    • http://pushbiz.fun/2016_toyota_corolla_key_fob_battery_replacementkw926.pdf
    • http://kejurudoji.medianewsonline.com/husky_air_scout_compressor_troubleshooting.pdf
    • https://cdn.sqhk.co/zejejofe/cQCjfjf/femok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_262793e1f5e14d98af7c0bf3b385f317.pdf?index=true
    • https://s3.amazonaws.com/gasodamuza/34319754041.pdf
    • https://s3.amazonaws.com/firudegix/craftsman_garage_door_remote_change_battery.pdf
    • https://s3.amazonaws.com/fulosobezur/texut.pdf
    • https://s3.amazonaws.com/naxozelozude/jupozibam.pdf
    • https://s3.amazonaws.com/mipeboro/93116219641.pdf
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_b8ce9d33eac04f8ebacf501b09b6e052.pdf?index=true
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_c34ae896d77a4ea59bad95b1fcb6f1b9.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f315.bin
993525ece33f185b83065b29efab1c89307f242041967a92290380205bf3adb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 5476 bytes
font_01_sfnt_off0001059a.bin
fd1e56344ab4bf0ac6c34dce684b29e0cb8aa32fc145acd22541d8e78da0b420		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1059A 3524 bytes
font_02_sfnt_off000113c4.bin
c091c53447a9a11d82eb939a13cd535b4f6ea116851a96c89e81eba0a89b737e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113C4 11280 bytes

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