Malicious PDF — malware analysis report

Static analysis result for SHA-256 534897d8abf3bedc…

MALICIOUS

PDF

94.0 KB Created: 2021-03-25 01:18:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: eb61d0d42c5257ad06a417b09fb2831b SHA-1: 59b0f852734726ef23134a1a7cc548b297414791 SHA-256: 534897d8abf3bedcc94892cfa1a3b3e47188830dabf77c30360445b83b7f7db1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The primary malicious URL, 'https://pelibifir.ru/award?keyword=genetica+humana+pdf+libro', suggests a phishing or SEO spam lure. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 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.
  • 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=genetica+humana+pdf+libro PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387433/normal_5fc5b93743af1.pdfIn PDF document text
    • https://pekafajifazudo.weebly.com/uploads/1/3/4/4/134478446/97d1e5b3c5.pdfIn PDF document text
    • https://jevizaja.weebly.com/uploads/1/3/4/8/134869407/purasaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485165/normal_60382e87e3dac.pdfIn PDF document text
    • http://kexumojazo.mypressonline.com/67350380555.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454678/normal_5fec2343ef202.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422637/normal_5fdecf2d73b53.pdfIn PDF document text
    • http://jajokojunewi.mypressonline.com/sagisewowipuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408464/normal_600fc2d44038f.pdfIn PDF document text
    • https://metidelesaweso.weebly.com/uploads/1/3/0/8/130813592/8631260.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5fe8f896e5291.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449965/normal_600043dcc2f54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368955/normal_601afa3cab8f7.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/shadowrun_snes_switch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456985/normal_6040bdb9d2663.pdfIn PDF document text
    • https://xerazagas.weebly.com/uploads/1/3/0/8/130813913/7a97ccf139c30f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fikuvine/35227138000.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/best_robert_kiyosaki_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/28728635301.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/zemusux.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/100_most_used_spanish_words.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/application_for_us_passport_online_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/how_to_calibrate_weighmax_scale.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/how_much_is_a_2020_maserati_granturismo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE0 5268 bytes
SHA-256: 289a69e6113ce2c2d4ff5f85511e0b4a704d0c0b89e2fb8f69259b95aadff414
font_01_sfnt_off0001308e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308E 13016 bytes
SHA-256: 6c8714cbb8835eaba4f3a312d26fe57edd878194f80e523c5b743d9ee6e67f26
font_02_sfnt_off00015a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A5B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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