Malicious PDF — malware analysis report

Static analysis result for SHA-256 390054ac3e4cabde…

MALICIOUS

PDF

75.4 KB Created: 2021-03-16 05:02:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b285f004c654e8e21a0a2a0c755f009d SHA-1: 5024c095e65eb8abeabff991bee3a6435f1ba7b8 SHA-256: 390054ac3e4cabdee98bc9a7c529a36259af933de9a196dac5b0e8b22736851b
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of embedded external URIs, with a critical heuristic firing for a PDF link farm. The document body is heavily obfuscated and appears to contain metadata related to wkhtmltopdf, suggesting it may have been generated programmatically. The primary attack pattern involves directing users to potentially malicious external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-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://crophysi.ru/wix?keyword=ingenuity+swing+portable
    • https://xuwosanilenerev.weebly.com/uploads/1/3/4/9/134900173/nuweletabeguvoluke.pdf
    • http://vumexovuvelafe.medianewsonline.com/49779240356.pdf
    • https://digojumowixev.weebly.com/uploads/1/3/5/9/135989627/3907014.pdf
    • http://freds.space/kivilelabodoxobevoaztgo.pdf
    • https://tajizaruf.weebly.com/uploads/1/3/0/8/130813694/7200916.pdf
    • http://youralteragoods.com/79488026826ym7bq.pdf
    • http://sosyaltakipcipanelin.com/genetizudoze3rqgg.pdf
    • https://gatepeduvemixif.weebly.com/uploads/1/3/4/6/134669895/lagabodekilumulewa.pdf
    • http://nadahul.ru/life_cycle_of_a_plant_ks2_worksheet4j5pp.pdf
    • http://ludirobus.getenjoyment.net/sigiloxedarenukavewir.pdf
    • http://verifybadgehelp.com/tokeribefenejajokozexufuwp7mof.pdf
    • https://gupebuxoguwev.weebly.com/uploads/1/3/4/3/134381402/5746094.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7cfbd632-948a-45fc-ba61-45a45309b1b4/how_to_restart_water_heater_after_power_outage.pdf
    • https://uploads.strikinglycdn.com/files/b9305fcf-d328-44f2-a347-029db1ef6788/george_foreman_grill_removable_plates_25360.pdf
    • https://uploads.strikinglycdn.com/files/b8bb9b17-76c8-424b-849c-db2c64e0b661/11410039443.pdf
    • https://uploads.strikinglycdn.com/files/888e651d-f7c5-4e51-8796-e164d231a105/70640111916.pdf
    • https://uploads.strikinglycdn.com/files/ea79093a-6b4c-4014-9752-e84c2328830d/jakalavukuduraf.pdf
    • https://uploads.strikinglycdn.com/files/ee9022d5-b1df-4f40-9935-4448a6709a84/journey_to_the_west_chinese.pdf
    • https://uploads.strikinglycdn.com/files/9e32ce41-63b0-48b1-8c25-c96a3aed4d5f/fender_mustang_lt25_guitar_amplifier.pdf
    • http://nabafutig.myartsonline.com/50282401616.pdf
    • http://nubimopupugu.rf.gd/1297803413.pdf
    • http://romofimor.onlinewebshop.net/xinomopisosawigaw.pdf
    • http://puxedasepuk.epizy.com/malayalam_movies_2019_sites.pdf
    • https://uploads.strikinglycdn.com/files/c5d8dc7f-1e88-4fef-8bce-7e2126ee494c/63977013852.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e959.bin
146f80682d71ad3b04fae044fa6ce280e029cd7c126c7f45a7258e31a10d179a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE959 5256 bytes
font_01_sfnt_off0000fb64.bin
b7306799f3b91097017c2a46ea88db8c1eb79af8399027f8cfcc3fc433d2bd11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 10996 bytes

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