Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf33bc5a3a1f16e3…

MALICIOUS

PDF

82.5 KB Created: 2021-03-08 18:26:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e2ba38dc6473231966bf3c50608df1ae SHA-1: 3cc80737a0e4577df9119e010b6b3321bfbf97ba SHA-256: cf33bc5a3a1f16e3ee672fc17952abf668a990eb41cfb58419af2d6bb3e26b00
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/award?keyword=anarchy+in+international+relations+theory+the+neorealist+neoliberal+debate+pdf PDF link annotation
    • http://losinglotterynumbers.com/little_red_riding_hood_jerry_pinkneycerpn.pdfIn PDF document text
    • https://kaferafodi.weebly.com/uploads/1/3/0/7/130775544/wuxotimewinu.pdfIn PDF document text
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/344542.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406812/normal_5febfa9ca41b6.pdfIn PDF document text
    • http://theandyhong.com/principles_of_development_5th_editiowu8u6.pdfIn PDF document text
    • https://pinipinemijik.weebly.com/uploads/1/3/0/8/130814728/pasitis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369343/normal_603ad6ec33163.pdfIn PDF document text
    • https://tajezutudod.weebly.com/uploads/1/3/1/3/131398094/3926976.pdfIn PDF document text
    • https://lopetumidola.weebly.com/uploads/1/3/3/9/133989387/977beca73.pdfIn PDF document text
    • http://bet-info.ru/nook_hd_plus_firmware_updatec1nfs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_6017b73370304.pdfIn PDF document text
    • http://manybigs.space/bodyfit_by_sports_authority_recumbent_exercise_bike_manualztvqa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381294/normal_5fd191351c334.pdfIn PDF document text
    • https://fivugolukebil.weebly.com/uploads/1/3/4/9/134902908/wiwekepowim.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/sinamozagemoger/corporate_website_design_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d66ecf-391f-4dd5-9433-adb8a75c1b24/muwidukuwuporesapom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fee86fb1-ab0a-4245-80c7-1da76076843a/40315817725.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/calibri_light_font_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/910e2ea0-7d36-48a0-930d-9e1a7b68d0a8/mefuwudireduwokubamur.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/audi_q8_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8468108-fb4f-4979-8b72-b23aef69efcf/bose_companion_3_series_ii_specs.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_off00010460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 5472 bytes
SHA-256: 6c3850b088807ae1f8bf417c5cf5053240e9d21c99f4394a4134466133008aa7
font_01_sfnt_off000116fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FA 10944 bytes
SHA-256: 266d9a953fa1650a0e86741dd38aeb1f40fb00631a2f1b1f2804c541b5bcc34b

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