Malicious PDF — malware analysis report

Static analysis result for SHA-256 6859de8bcd869b18…

MALICIOUS

PDF

99.0 KB Created: 2021-01-26 05:21:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7bff2090feef922267d153e1ffd74619 SHA-1: 7c62b8e98b43f30d0cec84f41a9288e2ff3f2c2c SHA-256: 6859de8bcd869b1860f876789ec247c7d41f38f309c6c387a88c6a29add654a4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and a link farm heuristic points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafffi.ru/123?utm_term=pajama+day+at+work PDF link annotation
    • http://gawuguvososu.iblogger.org/90031025877.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/cjfhhUs/91990689776.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/jbjjhaE/toffee_line_puzzle_game._free_rope_shapes_game.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/igjieIl/first_strike_bracket_na.pdfIn PDF document text
    • http://vitezozikupu.iblogger.org/wuwobaxut.pdfIn PDF document text
    • https://cdn.sqhk.co/busoleva/fRhi1ij/color_splash_hd_wallpaper_download.pdfIn PDF document text
    • https://kesoxebexug.weebly.com/uploads/1/3/2/6/132681937/93fbb629b518.pdfIn PDF document text
    • http://grampus-shop.com/8617961734196wur.pdfIn PDF document text
    • https://cdn.sqhk.co/javijaxim/0A2PYgd/83993917325.pdfIn PDF document text
    • https://cdn.sqhk.co/botuvawezej/jahiigf/vet_assistant_jobs_near_me_part_time.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/joDibjj/fidirorazegipi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jipudovisubu.rf.gd/79347640073.pdfIn PDF document text
    • http://kiwozoma.epizy.com/87843662503.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014de4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14DE4 28104 bytes
SHA-256: 47ff832f3a0030b6b9b16f8294013fce3429c6e0ed773a12f4ac7f4a6433cb00
font_00_sfnt_off00010e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E41 5096 bytes
SHA-256: d2802052a6bc0f79ea802795ccb57c3755db41ee1bce4dab74cc70356599a683
font_01_sfnt_off00011f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9C 14680 bytes
SHA-256: 020a6413f95b692e9ddbb7c57a247162c809e3f8f632462f9bbeb54a1d23f8e4

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