Malicious PDF — malware analysis report

Static analysis result for SHA-256 3125f9fd802c1a9f…

MALICIOUS

PDF

78.9 KB Created: 2021-03-19 09:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2854b60d86eb9cc79be767528538c92c SHA-1: 3378cf2a61ed83e1248eb0f0845e379c423a85d8 SHA-256: 3125f9fd802c1a9f83654fcb69eb65d2090e67a5d3793b1bef0908cb0ff22e61
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, including one on 'jacksth.ru'. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it may leverage embedded JavaScript or other PDF-specific exploits to redirect users, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jacksth.ru/wix?keyword=steamfest+2020+victoria PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426262/normal_603e6ffb770e9.pdfIn PDF document text
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/vazemijilisik.pdfIn PDF document text
    • https://bumewotosebixab.weebly.com/uploads/1/3/5/2/135298585/11c3d48c04ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423171/normal_600c6d9c91e50.pdfIn PDF document text
    • https://kipamafulu.weebly.com/uploads/1/3/4/5/134588126/7444221.pdfIn PDF document text
    • https://pemowazazafal.weebly.com/uploads/1/3/5/3/135385959/kekagu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_6016b552c52f8.pdfIn PDF document text
    • https://dabosuze.weebly.com/uploads/1/3/2/6/132695252/9425818.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
    • https://uploads.strikinglycdn.com/files/adec32d2-762d-4500-a686-22b525e07844/39223663299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e841d169-5c3e-4dc1-8828-6b2e984a91fa/how_to_fix_leaking_insinkerator_hot_water_dispenser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ecfbbf6-32ff-4f9c-bed7-784432bf9d19/call_of_duty_xbox_one_x_crash.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5dfbd02-bee2-414b-8e6d-0e38183492d5/toshiba_synaptics_touchpad_driver_windows_7_64_bit_download_filehippo.pdfIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_4b4d2dede0a747cb812bd1ef18853ab3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5de37e3-6e49-469c-8dc7-aaa157c71b19/delunimod.pdfIn PDF document text
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_b3e033b3cf67460e95e4addfbff45e76.pdf?index=trueIn PDF document text
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_fec54ad4c81c41b0ac07ffde9a167811.pdf?index=trueIn PDF document text
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_200d7dff49444a21accf4dbe52248f79.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aa1f737-0221-479e-a060-53f6676ac68f/10330629128.pdfIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_7fee38794729438e8408a761887a58b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9045675f-b3bb-4fcc-8508-9ca290b3cc4f/how_do_i_reset_my_krups_nespresso_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1386a804-d850-41cd-994a-05e565ce712d/pisizexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2143b67c-713f-45b1-b9f2-00df474b2927/48677615398.pdfIn PDF document text
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_2b94f478cbd04c419b680f47bda89fd7.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_404d15180b0d4554a47c6e1d4e0feb85.pdf?index=trueIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 5116 bytes
SHA-256: 59b0fe9b7dd5d2ba4712b5ced34e730c37ca128e90abc0e62dbe212bdecc02e4
font_01_sfnt_off0000fa7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7B 11032 bytes
SHA-256: e45501a0eb5fd6f1b5a3c1617989ec5d6484b765f7dfef9c4322427c99d20b5c
font_02_sfnt_off0001204e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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