Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd773f587e2cf0d…

MALICIOUS

PDF

81.9 KB Created: 2021-03-22 19:14:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 85ec7e756fcaad6d456ffabae1a0c90e SHA-1: 9d9f8851a319bbb6540d70f2bc6bd32261baa034 SHA-256: 7fd773f587e2cf0db1eb270d4bdc0d0b5ea0784e3bc3e581aa96daf09a3ca013
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=fun+multiplication+worksheets+grade+3+pdf PDF link annotation
    • http://fc-aromat.ru/how_to_write_a_bad_restaurant_review_for_schoolvc4qd.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/YidFNVn/cyberpunk_2077_night_city_map.pdfIn PDF document text
    • https://cdn.sqhk.co/wimedizi/ehezGWi/15488034766.pdfIn PDF document text
    • http://fakibukilab.22web.org/blue_yeti_mic_not_showing_up_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/mozedizupi/hg7tW7d/protect_your_girl_quotes.pdfIn PDF document text
    • http://jipososuwo.iblogger.org/bikusinaxelu.pdfIn PDF document text
    • http://biomanix.best/92172195486er7o4.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/eIkwigI/piruzisas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://punejuwomus.epizy.com/associated_press_stylebook_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/kudekuwenerajun.pdfIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_2cb702504e7942c9871dde6c2b95b82e.pdf?index=trueIn PDF document text
    • http://lagadasisipas.rf.gd/tebibanekebufikosufemulut.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_3738ea9ff6994713a215437a6c35ee28.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_34768f55afc64455b6db6465970ef981.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dumupa/schwinn_womens_ranger_26_mountain_bike_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/dslr_camera_ke_photo.pdfIn PDF document text
    • http://gawuvuv.epizy.com/beard_brush_photoshop_cs6_free.pdfIn PDF document text
    • http://kixilobulutipe.epizy.com/tuxugekunufubalitopomoxet.pdfIn PDF document text
    • http://latuwukatagowa.epizy.com/mutual_non_disclosure_agreement_template_canada.pdfIn PDF document text
    • http://pumejusatojajeg.rf.gd/zonawimutisubujefutilu.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_43cf35f6f0c6473e9abe1be29ae57ea2.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 5844 bytes
SHA-256: b9a4c0b7c73f5fbf6c752f46d22c6eceb09d6fef4593de4a2759a212e7e7145e
font_01_sfnt_off0001127b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127B 11812 bytes
SHA-256: b506a15fc21abeccdf24057828d30ec731f16319ecd162b336f909605245229f

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