Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f28c827115d78e3…

MALICIOUS

PDF

86.2 KB Created: 2021-04-15 18:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7657f244842969c0c306402cf11052b9 SHA-1: 23f1d71b706d04ac2aa1ced2ee6c32fdecc92bad SHA-256: 4f28c827115d78e3a34379f8e65bd5b0c13cd4acc35ec98498803a2c52de9d07
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, forming a link farm, with several pointing to disposable domains and potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://lozipotod.ru/strik?utm_term=fifty+shades+freed+hindi+movie+filmywap PDF link annotation
    • http://coolvdomaion.online/62203990570zoa28.pdfIn PDF document text
    • https://kuserivexujeza.weebly.com/uploads/1/3/4/3/134331384/3821796.pdfIn PDF document text
    • http://frasqen.online/das_wunder_von_bern_musical_dvd5z0v3.pdfIn PDF document text
    • https://mixusabap.weebly.com/uploads/1/3/4/0/134096097/751149.pdfIn PDF document text
    • https://xexomogaju.weebly.com/uploads/1/3/1/4/131438449/bogojumat.pdfIn PDF document text
    • https://filikegepux.weebly.com/uploads/1/3/5/3/135346592/xafipulivalebedewu.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/9d7a56e2-e812-4bda-9a44-b42a2c57bf3c/12358669995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aa16cf7-2bba-41ac-9fcc-b52eefdfd89b/el_rancho_coronado_hotel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a5d1c2-8b19-4c2f-905c-01ff8c016d30/christianity_major_beliefs.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/dobajotik.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/tiwituzed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6c925cf-0b5e-4754-8ee5-156c4f0d33a1/jivuzodawev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37998698-27e9-4349-a0e4-bdd4b14afa1f/happy_endings_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/198bf708-383f-430a-9413-dcfee1d191f3/20988110701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc4a2d69-c46c-4830-b5dd-37baf36782b9/tilegowupomofapulukas.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/ccap_application_illinois.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/704ca74f-1c8e-431b-bc6d-7f1113fafcff/apc_back-ups_xs_1300_battery_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/453f8860-f929-4587-aec9-77bf7a01dc2e/fowarexagavinaredigog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/023fc60f-e494-46af-a37a-0a00dcc03074/69429495192.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/perfect_attendance_certificate_template_editable.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00013003.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13003 16888 bytes
SHA-256: 85c9e51167542fba8914bdf9c8b3a2634ec0a6af69ea36e46c3501ff57da6a99
font_00_sfnt_off0000dadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADF 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 5492 bytes
SHA-256: 08ff9bf63aa3c818b7cc6ca883e67edcfbe7e34e962079e323079fd9f0e633fa
font_02_sfnt_off0000fe66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE66 2600 bytes
SHA-256: 720c7ee0223dbd7186aa8c2bf94b41037491296fc71a7cc9a6bb6fd4dd07949b
font_03_sfnt_off000109f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F2 11080 bytes
SHA-256: 4b45de2cbc24972c5ef0452446502f1523bf1ede93cc8ae2bf189e1cf187163e

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