Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7aa1256e49a085…

MALICIOUS

PDF

78.8 KB Created: 2021-03-07 12:04:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 82bf07c4134019b2766d32aad1a97a66 SHA-1: 2530123e6d054c56c3af6ef027728ee6ed0bf7e2 SHA-256: 9a7aa1256e49a08555c99b4a748438fbbd3ca0ff1062cc1bc4aabff60a1df9b5
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jumiwimov.ru/strik?utm_term=vox+ac15+amp+kit PDF link annotation
    • https://cdn.sqhk.co/daluzowinasu/aBjgbY9/xbox_series_s_amazon_link.pdfIn PDF document text
    • https://miniroworopan.weebly.com/uploads/1/3/4/4/134444940/modiro-zozoz-piduzawipipux-limetililebi.pdfIn PDF document text
    • https://cdn.sqhk.co/vekudaselux/ihgdDpk/baby_fun_park_baby_games_3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366325/normal_602abbd4554e2.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/Aiiieii/hello_kitty_cafe_truck_walnut_creek.pdfIn PDF document text
    • https://cdn.sqhk.co/werutojij/jgduokp/35277166726.pdfIn PDF document text
    • https://ribigitapupag.weebly.com/uploads/1/3/4/8/134887221/dovukob-bikuzerabowoner.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476272/normal_5fd315a9de5de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/3688118363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/220c6c84-1021-4c2f-9a07-fe0bfafde7ca/where_do_i_send_my_cdl_medical_card_in_ny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72403e98-32e9-4cd7-938d-cef815053fc6/how_to_take_apart_a_keurig_k_compact.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dc5338c-79e3-4f98-ae0f-d98176df44f2/fokaj.pdfIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_7b1949a04e014629b14a540f3ab6a55b.pdf?index=trueIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_2df81ea926ae492e98ca4d373d917f96.pdf?index=trueIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_349fe87d66dd4b0bbf57254a6ce12128.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zesixefe/7175367099.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f04dbf48-d77c-4082-8d7a-c3cb00d5f27e/what_is_the_word_first_in_the_nato_phonetic_alphabet.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76A 5048 bytes
SHA-256: 8af9342170e210370bf4528ea0491fe9be58636bfa31bf7fa029d47f87854741
font_01_sfnt_off0001089b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089B 11248 bytes
SHA-256: d893056d314b8b1999fe721e745f9f88c20ae59dce437d0a97af1ab973916317

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