Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e76c5d557cd022…

MALICIOUS

PDF

63.9 KB Created: 2020-10-02 15:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 42ebfb12b290f0021646e9619876defa SHA-1: e9d5efffe4e0a5ff7312ae94d2594f0f27ae2e29 SHA-256: 64e76c5d557cd02200097b9cf67e18050a20da82e8ee861b4eebdb5c5d05a747
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains multiple embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to a malicious site via these links, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/pify?keyword=hashihime+of+the+old+book+town+length In PDF document text
    • https://site-1037885.mozfiles.com/files/1037885/89999547767.pdfIn PDF document text
    • https://site-1036686.mozfiles.com/files/1036686/16840337870.pdfIn PDF document text
    • https://site-1037848.mozfiles.com/files/1037848/90792807906.pdfIn PDF document text
    • https://site-1036823.mozfiles.com/files/1036823/vaxupasivojufixakafu.pdfIn PDF document text
    • https://site-1037228.mozfiles.com/files/1037228/48539601922.pdfIn PDF document text
    • https://site-1040431.mozfiles.com/files/1040431/49162656493.pdfIn PDF document text
    • http://nofijam.jakesden.com/uploads/1/3/1/3/131379732/501e4e3e7ee6033.pdfIn PDF document text
    • http://riwivus.tnacc.net/uploads/1/3/0/8/130874364/xefixexev.pdfIn PDF document text
    • http://files.centertowndfw.com/uploads/1/3/0/7/130738903/1040508.pdfIn PDF document text
    • http://files.mountaineerbassethounds.com/uploads/1/3/0/7/130740492/2971724.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/1fb77763-eeeb-4197-96b1-2576b1217d3a/divajumelukemiziwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a9c582c-ebbc-400a-ba79-cf17bcff9cb0/mavupefile.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A8E 5520 bytes
SHA-256: 93f53118fbda1ba887902d2227b9310dfc6f62514d8c117738ec794f4881591e
font_01_sfnt_off00008d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D72 5268 bytes
SHA-256: 0fb936c252935f76fe324968f8b42c69cab9cb8c18d99c3c8b020aa3fb381a91
font_02_sfnt_off00009f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F42 2012 bytes
SHA-256: 98de79b297e3797e740cfbde3538a37bcda84e2cac2672723d669a8421f405b8
font_03_sfnt_off0000a879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA879 10156 bytes
SHA-256: bb052f6cf01418dcbd3585a1ed9f219e8e00c5cf541449dc415c5be3d519407b
font_04_sfnt_off0000cb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB68 16952 bytes
SHA-256: 80aa5b6d848ae6f022488bf184082c8b8dd010ec35a94fd35b6451a9c8273f1f
font_05_sfnt_off0000e2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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