Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5ec6a873860684…

MALICIOUS

PDF

87.7 KB Created: 2021-03-05 15:23:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d4d935f3f756cda3c183e8eead75333a SHA-1: eecc1fd61e0d536e6b4594f081ecf8d33a783638 SHA-256: 9c5ec6a8738606845b07e218d014fbd36a898d06c8c0d3fb8a4fc32a84341f39
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to disposable domains and redirectors, indicating a phishing or scam attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. While no scripts were extracted, the structure and link farm nature of the document strongly suggest a malicious intent to redirect users to harmful sites.

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
  • 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://crophysi.ru/strik?utm_term=what+zodiac+sign+is+november+22+2006 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4492573/normal_600c7652cb0b6.pdfIn PDF document text
    • https://cdn.sqhk.co/danajuva/jeaWVic/disney_movies_2020_release_dates.pdfIn PDF document text
    • http://nizuloxodiza.iblogger.org/56447629372.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/murray_6.5_hp_lawn_mower_spark_plug.pdfIn PDF document text
    • https://cdn.sqhk.co/posogamumut/aYv45gf/gukeli.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/best_udemy_course_for_data_structures_and_algorithms_in_python.pdfIn PDF document text
    • http://wuroguredogir.getenjoyment.net/dofonigorosi.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/wUhefvi/86279004531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453901/normal_5fe709b32d1dd.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/what_kind_of_hydraulic_fluid_goes_in_a_kubota.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nabulegewuwal.myartsonline.com/33123953318.pdfIn PDF document text
    • http://japamitafixe.myartsonline.com/80907010864.pdfIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_2205c05457664dd7bc0c122de9c220a2.pdf?index=trueIn PDF document text
    • http://lonesopuw.onlinewebshop.net/what_tech_stocks_are_down_today.pdfIn PDF document text
    • http://sitiwaruto.rf.gd/english_horror_movies_in_tamil.pdfIn PDF document text
    • http://robopawize.epizy.com/coloring_sheets_kindergarten_halloween.pdfIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_8e0d867d9ec543f98bee3d6c1109db1a.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_off00010178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10178 6012 bytes
SHA-256: 2e6b1963e73cf15539c09222c416475bdfa47575e58c0dc80ccdcd8c242112a9
font_01_sfnt_off000115da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DA 11376 bytes
SHA-256: 7b4708f2ddc0ae9ea4bd749223e592e0f1d4b8dbdf3245716f16163a90f6fb13
font_02_sfnt_off00013c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C49 16128 bytes
SHA-256: 284aee53af3517af13f2a66e76d01370c5f7d2860fe2323ff4d7d210970ddaf3

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