Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0bf7d036b59548f…

MALICIOUS

PDF

99.7 KB Created: 2021-05-11 01:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c87a7431e5be8bb65565ce7b316919c SHA-1: 253231536af3864d9c1731f3e42c39dd99bc358e SHA-256: b0bf7d036b59548fc7a5038fcb8ceea02f296edf9f6292fbef75b3414e0e5550
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing malware, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=warhammer+40000+v8+codex+pdf+vk
    • https://jakugogafezokev.weebly.com/uploads/1/3/1/4/131437362/8186805.pdf
    • http://siwarezowagi.iblogger.org/15126939961.pdf
    • https://dujisiseruw.weebly.com/uploads/1/3/0/7/130776106/9571172.pdf
    • https://jodisugej.weebly.com/uploads/1/3/4/7/134732418/d8f58.pdf
    • http://rugegav.mywebcommunity.org/98093426674.pdf
    • http://kulokozataxat.22web.org/17695615351.pdf
    • http://zikewexer.scienceontheweb.net/test_your_english_vocabulary_in_use_advanced_with_answers.pdf
    • http://lulizukudomiz.scienceontheweb.net/fotifetipumoxibop.pdf
    • http://kapovulup.mywebcommunity.org/jomamimekukipof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_4d61578a527044488c9656cba5e5d30d.pdf?index=true
    • https://s3.amazonaws.com/wupuxus/dodge_ram_service_parts.pdf
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_691b2c4c503648f1ac4aa8f19c79f2b0.pdf?index=true
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_e7826f7fe8104417b58aa57d729c5f61.pdf?index=true
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_78536e2fa1864c82b03886bc1378f7e5.pdf?index=true
    • https://s3.amazonaws.com/rogugagatuf/java_update_191_64_bit.pdf
    • https://s3.amazonaws.com/kewakuko/lozepabitokalibusira.pdf
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_9b34b7d8a68f4f29a601f29a698072c1.pdf?index=true
    • https://s3.amazonaws.com/kufazete/small_blood_stains_on_bed_sheets.pdf
    • http://vuxekote.rf.gd/nenutududeguf.pdf
    • https://s3.amazonaws.com/retobifulipo/canoscan_lide_210_driver_free.pdf
    • http://wadoromutisagar.myartsonline.com/how_much_weight_can_a_pallet_jack_hold.pdf
    • https://s3.amazonaws.com/fukepez/redis_3._2_for_windows.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a25.bin
fd1666b06be80ae5a0296ac445d359acabd35ed6c6f194a3d574c0132069b642		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A25 5816 bytes
font_01_sfnt_off00013de7.bin
b60bcc4cee9c14aab7a20869b0269af0d33dc571b329289823032cc8c5d79492		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE7 13648 bytes
font_02_sfnt_off000169fc.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x169FC 16204 bytes

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