Malicious PDF — malware analysis report

Static analysis result for SHA-256 8146eb8a710d3bf9…

MALICIOUS

PDF

113.3 KB Created: 2021-03-21 09:31:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1942086d328ddbfd339468d2a2711f75 SHA-1: 161847a0383a9fccef285114eae4d21d1099afcc SHA-256: 8146eb8a710d3bf985aeb35549f3fd7db044ad49251d5edea1bb17e072772d63
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malicious redirection scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ponafet.ru/123?utm_term=android+sqlite+create+table+query
    • http://xadikefivo.iblogger.org/printable_handwriting_worksheets_for_2nd_grade.pdf
    • https://muwikilakejo.weebly.com/uploads/1/3/4/5/134519857/0970950243d.pdf
    • https://cdn.sqhk.co/lebereme/jjhieqm/amc_24_showtimes_hamilton.pdf
    • https://cdn.sqhk.co/tusufawenu/b9LbjfM/64435533429.pdf
    • http://vuwunap.22web.org/99297183401.pdf
    • https://fugiweritukasuj.weebly.com/uploads/1/3/4/6/134682589/pidedupe_pugukedolebo_tavisiz.pdf
    • http://benovezim.22web.org/tosubidapidovovobetuwesid.pdf
    • http://kituzedelo.iblogger.org/76363010102.pdf
    • https://vufupobuzalezu.weebly.com/uploads/1/3/4/8/134853030/bac34a358b1.pdf
    • https://cdn.sqhk.co/raninogozo/gcphjif/sowebuzinagorerine.pdf
    • https://ximabetewu.weebly.com/uploads/1/3/1/3/131384229/3916671.pdf
    • https://cdn.sqhk.co/mesafovojifo/ifhfjh8/74207743264.pdf
    • https://tudodamoziw.weebly.com/uploads/1/3/1/8/131872054/1dcb09c93e356.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/331752c2-8e17-4461-9ff1-65ddf2c8ab12/rinixekerovirilawi.pdf
    • https://uploads.strikinglycdn.com/files/9452b804-471d-4d37-b7af-62b7533a4f3a/how_to_pair_beats_studio_wireless_1.pdf
    • https://uploads.strikinglycdn.com/files/314b0a95-62f7-4332-8726-561866ce95dd/jifumosolibekoxutajonil.pdf
    • https://uploads.strikinglycdn.com/files/4d4183a0-09ab-4937-907d-acaa5adad1be/where_the_wild_things_are_baby_shower_food_ideas.pdf
    • http://kadoluwanib.rf.gd/55452885887.pdf
    • https://uploads.strikinglycdn.com/files/1c6e4f9d-1a3d-4c08-a235-8a9d52ff8cab/95561129604.pdf
    • https://uploads.strikinglycdn.com/files/85275e45-f01b-45da-b943-0f06aea06bd3/nugasipedij.pdf
    • http://kenumubozejofum.epizy.com/atomicity_definition.pdf
    • https://uploads.strikinglycdn.com/files/0da9cc9b-4b8e-4760-be54-2838d2ee1838/which_is_the_best_cordless_phone_to_buy.pdf
    • http://veruzixiki.rf.gd/kafemerabez.pdf
    • https://uploads.strikinglycdn.com/files/28c68207-c893-4c4c-9112-f3f0144205fa/zazokemefupelowuretumimuv.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f158.bin
45c9a387aa635ed1a79ef73f7c790614c85ed668a71b64f1011173eba8f5e4e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 37652 bytes
font_01_sfnt_off000165a9.bin
36a52cc557c53353737e229ef0137bc5b3d3db9be3fa4b1fc0093a5d618d51a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x165A9 5288 bytes
font_02_sfnt_off000177b6.bin
a71f897ec925781ad6c93274ff262d66ff9000f9e38e557399ee2d674f803e90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x177B6 11848 bytes
font_03_sfnt_off0001a04f.bin
149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A04F 16036 bytes

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