Malicious PDF — malware analysis report

Static analysis result for SHA-256 64157d9fd1456ab6…

MALICIOUS

PDF

116.5 KB Created: 2021-03-22 20:37:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 19102076db32f6e0b94c7d4e41d9a26f SHA-1: 61544e48eefcc890f7e16f222e6c2d5e5b9c40c0 SHA-256: 64157d9fd1456ab63f05948cc15fa943f0bce1008b373d0e6b1d43a47d8568d9
126 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains numerous embedded URLs, with one specifically pointing to a suspicious domain 'jacksth.ru' that appears to be part of a link farm designed to lure users. The document body, though heavily obfuscated, suggests a deceptive lure related to game content. No scripts were extracted, but the presence of multiple external links and the overall structure strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=elite+race+wars+csr2+2019 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377125/normal_5fc8c3d4123c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456399/normal_601110dda37b6.pdfIn PDF document text
    • http://lojuxaga.mywebcommunity.org/auditing_and_assurance_principles_12th_edition.pdfIn PDF document text
    • http://supportcopyright.net/two_bit_personality_traits6ypn5.pdfIn PDF document text
    • http://xepuxesadara.mypressonline.com/all_american_pressure_canner_for_sale_used.pdfIn PDF document text
    • http://gatorama.site/ge_toaster_oven_knobnjqye.pdfIn PDF document text
    • http://lupupive.22web.org/53346340350.pdfIn PDF document text
    • http://4338bacchus.com/chess_openings_pgn_database_downloadrhmg8.pdfIn PDF document text
    • http://xivokosu.iblogger.org/38388780926.pdfIn PDF document text
    • http://kofojoxake.mygamesonline.org/lawurebabotilejadujivela.pdfIn PDF document text
    • http://paxejunon.mygamesonline.org/api_527_latest_edition.pdfIn PDF document text
    • http://tersq.space/zejufoturulebilotahtmz.pdfIn PDF document text
    • http://meetporte.xyz/fudebilorisutosijizexivgaevx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://db38eef3-7d65-43a4-badd-ba39ed7d9417.filesusr.com/ugd/bd2483_79a8185c6af648878feecb1b16edd75c.pdf?index=trueIn PDF document text
    • http://nafaradevofipaf.myartsonline.com/revutu.pdfIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_c4557ee0a8254e19a8b4fd29174d9c4c.pdf?index=trueIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_07654f3ce5894e0083efdc1650364e3c.pdf?index=trueIn PDF document text
    • http://zujisofivo.onlinewebshop.net/mind_and_world_john_mcdowell.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://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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001556d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1556D 5324 bytes
SHA-256: 4a1c0b828e4441193ad44c1cc943776571a7f30ad03c3acc13bbccb5c1018458
font_01_sfnt_off0001679b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1679B 7580 bytes
SHA-256: bb0ccabff6099a6ac6e29bf7487398380424bf4f8d511ddc465ec99fc0dd1ec1
font_02_sfnt_off00018147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18147 12052 bytes
SHA-256: 3f81d379f0fec02ccef71aea95886be0c95754ef3a6c2c53a48bbe1a6b5dd7a3
font_03_sfnt_off0001a9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9A5 17060 bytes
SHA-256: 321a7978075656b5aca0b25648d477b41ad1566356725ae25d4c1a6e6c4ef383

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