Malicious PDF — malware analysis report

Static analysis result for SHA-256 2975961fd7173f4a…

MALICIOUS

PDF

74.7 KB Created: 2021-04-03 20:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d61e5c802894682c0bd055b39577a5d SHA-1: 299d6271e0e95f480cf37cc2ec66dd4a4c9bf881 SHA-256: 2975961fd7173f4a42a585cb85d2bde7728d1c6f852fe444263a7f0de779bcab
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving the exploitation of PDF vulnerabilities or social engineering to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/wix?keyword=doom+flash+edition
    • http://zavarivaemvmeste.ru/your_song_easy_guitar_chords_no_capou7g6r.pdf
    • https://cdn.sqhk.co/dixejetafap/fIoghgc/15460271658.pdf
    • https://cdn-cms.f-static.net/uploads/4366662/normal_6023ee608f68a.pdf
    • https://cdn-cms.f-static.net/uploads/4383470/normal_6046a222033f9.pdf
    • https://limejanokevipa.weebly.com/uploads/1/3/0/7/130739330/800e2.pdf
    • https://cdn-cms.f-static.net/uploads/4366367/normal_604d68a6d283e.pdf
    • http://tixobedo.22web.org/rurowotuvodubefikeg.pdf
    • http://josobagilila.iblogger.org/visio_bpmn_stencil.pdf
    • https://zoxujaratufopa.weebly.com/uploads/1/3/5/3/135399722/zerunupata.pdf
    • https://static.s123-cdn-static.com/uploads/4484107/normal_5fded72d9d4ed.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • https://cdn.sqhk.co/towinomer/hehrhjA/40484212007.pdf
    • https://lexapokugivida.weebly.com/uploads/1/3/1/8/131856754/zavesujug.pdf
    • https://cdn-cms.f-static.net/uploads/4375083/normal_60580dec35c42.pdf
    • https://zekilunadaxidub.weebly.com/uploads/1/3/4/6/134631079/ketibug.pdf
    • https://cdn-cms.f-static.net/uploads/4372735/normal_6061fa6aefcb6.pdf
    • https://cdn-cms.f-static.net/uploads/4375351/normal_60602d8de7137.pdf
    • https://cdn.sqhk.co/naxudufejik/FyXgcgd/bowling_3d_apk_mod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://taludoxatimepup.rf.gd/2_digit_addition_without_regrouping_worksheets_2nd_grade.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da12.bin
c1f534ecf19ab5dd4bec074efddcd333317b946cb3e436f9fe0d70ebaa567560		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA12 3016 bytes
font_01_sfnt_off0000e4cc.bin
7ee3ffacb2c58b61f7cf2c67ec3d1b7eb983f8b1d18d185da2dd4e566075c8db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 5048 bytes
font_02_sfnt_off0000f5d7.bin
883f6b24a603529c6a8de52af9496972f6b18353a5db4bc7866e815bbc3b52eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D7 11760 bytes

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