Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b941ec3ce6503d3…

MALICIOUS

PDF

112.6 KB Created: 2021-03-28 09:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c54f8e2a3d1ee75d82a7ea72651dbe04 SHA-1: 59b3a14d3d5102f9cdbfef7d50ef5b9c2e923b76 SHA-256: 9b941ec3ce6503d301577e87f54626a3a0ee26ff7a253211eb668020f91b0ee7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded document body text is heavily obfuscated but contains references to 'obelisk of axum pdf' and 'wkhtmltopdf', indicating a potential lure to disguise the malicious intent. The primary goal appears to be redirecting users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ponafet.ru/award?keyword=obelisk+of+axum+pdf PDF link annotation
    • https://cdn.sqhk.co/ravusigi/Lhijhij/27435705923.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387562/normal_6004684aa5310.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/fqcYgdA/49817575617.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425238/normal_5fe93948ca0ef.pdfIn PDF document text
    • https://cdn.sqhk.co/lajoroteb/Jgehj1Q/my_chicken_simulator_codes.pdfIn PDF document text
    • http://xuvivok.22web.org/wonderwall_guitar_sheet_music.pdfIn PDF document text
    • http://yatvoyya.fun/corsair_commander_pro_management_control_board__software_1x_boardutygm.pdfIn PDF document text
    • https://zijepujalikok.weebly.com/uploads/1/3/1/0/131071164/fegofakinorozagupa.pdfIn PDF document text
    • https://cdn.sqhk.co/wisewuguv/dddjfwu/44466077256.pdfIn PDF document text
    • http://apkweb.net/kesusowerituu8xlr.pdfIn PDF document text
    • https://tagopudul.weebly.com/uploads/1/3/5/3/135392217/joxof_dovuse_buxiloxaguxifi.pdfIn PDF document text
    • http://pulofinifop.iblogger.org/space_jam_game.pdfIn PDF document text
    • https://wisowoturap.weebly.com/uploads/1/3/1/4/131453432/bololanamonavupojero.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452850/normal_6026fc77de6a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448976/normal_5fd897aaeca88.pdfIn PDF document text
    • https://jipoditilab.weebly.com/uploads/1/3/1/4/131407274/nefodesaloz.pdfIn PDF document text
    • http://piwulefimer.22web.org/internship_project_report_sample.pdfIn PDF document text
    • https://dikoriwapajok.weebly.com/uploads/1/3/4/4/134447187/lawadawa.pdfIn PDF document text
    • https://vodemilofokuse.weebly.com/uploads/1/3/4/2/134235674/redowuvodajalu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377912/normal_6016e16d37a56.pdfIn PDF document text
    • https://cdn.sqhk.co/wumidimux/Zjbgijd/liguzifuder.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://toxuvadamutetix.rf.gd/drawing_books_for_tattoo_artist.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
    • 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5A 12508 bytes
SHA-256: bf95100f8ceaa1f7a0c9980ea6abcf48f16cc918e8c1b5c7eb7cdbf10b86393a
font_01_sfnt_off0001300c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300C 6348 bytes
SHA-256: 100dfe57612d0888e749d9ebcdd12a244d223a7e273d51875694e95d2d98552c
font_02_sfnt_off000145c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C8 5084 bytes
SHA-256: f56e7fa92de8e04d8e8cc8528be82acaf8c941050c7fb1279e113ecccba8c0c5
font_03_sfnt_off00015715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15715 18508 bytes
SHA-256: 00c2482d969035ba95c8bc2506bbde8b31d5e8dce3645e70f96bb71b890dc1cb
font_04_sfnt_off00018d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D16 17080 bytes
SHA-256: 6cc4a5c3d0738d5d81186f0fe47e292ec93daee75182b10d474ed32b8a66028f
font_05_sfnt_off0001a5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5D2 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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