Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b281dc5bcc4cb0a…

MALICIOUS

PDF

78.3 KB Created: 2021-04-08 00:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0208a0cbcd310344f6811969ba3f0084 SHA-1: 993e5245ed6a56f16224acf3427ebc1638541c3e SHA-256: 2b281dc5bcc4cb0acfebf827b74b011f9e07fced848e56e0ae2b871cd87cda74
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, and another that appears to be a lure for 'tempstar furnace filter replacement'. The document body is heavily obfuscated, but the presence of external URIs and the overall heuristic firings suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wb?keyword=tempstar%20furnace%20filter%20replacement PDF link annotation
    • http://islemleriniz.org/immanuel_kants_view_on_aestheticsug51t.pdfIn PDF document text
    • http://neditaxuvim.getenjoyment.net/zavawexolujuwa.pdfIn PDF document text
    • http://cooldomen.space/ponezrxhqg.pdfIn PDF document text
    • http://vosusapar.22web.org/93992659935.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vogilidiniluti.rf.gd/52589454138.pdfIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_9505e3b17db449d58cedc4bacbbc5c33.pdf?index=trueIn PDF document text
    • http://gaderaxanaru.epizy.com/xudofiwunixatisasesoga.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_4b27c5526177486d9c150e52cd5a03eb.pdf?index=trueIn PDF document text
    • http://wusumuforibit.epizy.com/66441513201.pdfIn PDF document text
    • http://tunowik.epizy.com/rojivivapanizaziza.pdfIn PDF document text
    • http://vojemigami.rf.gd/3266499302.pdfIn PDF document text
    • http://nalasorujuwasop.rf.gd/can_you_sue_a_school_for_child_endangerment.pdfIn PDF document text
    • http://sogoxutagejuno.atwebpages.com/sorekerofisas.pdfIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_323de6475800425fb9dbc4f7552653fe.pdf?index=trueIn PDF document text
    • https://18bc7be3-897e-46c1-a475-efc190d089bd.filesusr.com/ugd/62845f_76f68ab0c9a343f887d179a3250e1f48.pdf?index=trueIn PDF document text
    • http://sujotoginejo.rf.gd/lezusulakidib.pdfIn PDF document text
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_9ee317d2b2604536a69e5dceb4026d08.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF30 5112 bytes
SHA-256: 21f237f161c0124eb5e371cefabbfd398c62e2b2045f4f647103535ddd395f4c
font_01_sfnt_off0000f078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 10804 bytes
SHA-256: 17c2fff5f76195b1adcdcc844e4c181fa8ba6489b8ca4d34007eb2d57bfb39e9
font_02_sfnt_off00011597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11597 16448 bytes
SHA-256: 3f7f6beb0f5865f83039c8434023d34048916fbab515aea8bfee4d6c7e3f3101

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