Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95894f75605a073…

MALICIOUS

PDF

71.7 KB Created: 2021-03-11 23:51:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 556f4be76a958bfc0d599a9f601f993b SHA-1: b9f35ab044082c2d49300052e36b3f5fb2aebc90 SHA-256: a95894f75605a073633ea8b75e8952fa75108adc7b8f65ae581a4826598e13e8
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, with a primary suspicious URL pointing to 'nipisod.ru'. The document body, though heavily obfuscated, appears to contain keywords related to search terms, suggesting a lure to generate traffic to these external links. No scripts were extracted, but the PDF structure itself facilitates the embedding of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://nipisod.ru/award?keyword=quantum+machine+learning+book+pdf PDF link annotation
    • https://guxofoxevi.weebly.com/uploads/1/3/4/7/134737998/mazuselunanol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366976/normal_6046e0f5eda1a.pdfIn PDF document text
    • http://telovajov.medianewsonline.com/does_leo_die_in_the_blood_of_olympus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402948/normal_5ff24e97d71a0.pdfIn PDF document text
    • https://ropaligezavizaf.weebly.com/uploads/1/3/5/9/135962070/givik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445326/normal_5fe33ce8d1c5c.pdfIn PDF document text
    • http://bulubuzigajuzar.getenjoyment.net/schulferien_baden_wrttemberg_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426090/normal_5fd9c1403a53b.pdfIn PDF document text
    • https://gafewabonir.weebly.com/uploads/1/3/2/6/132696171/mimivemara-regiporojunita-fotinugi.pdfIn PDF document text
    • http://pinopizo.sportsontheweb.net/59960338535.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/farokof/90704378683.pdfIn PDF document text
    • http://wazeniwemir.onlinewebshop.net/81242623783.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/lagu_cinta_luar_biasa_cover_aviwkila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0038ee2c-072b-45f8-83be-475a0316a5c1/puwomeri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11c03537-21a0-4899-bb48-7dd9333f5d51/how_to_use_charcoal_pencil_for_portrait.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/scanner_camera_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/office_rental_agreement_template_singapore.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/susimutagixezuvejufojopiw.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/coolyori_meme_template.pdfIn PDF document text
    • http://dolanuvusipegu.myartsonline.com/jamesitowezuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/civics_and_economics_constitution_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bea2a928-27b6-42e4-adc0-e6e234298a49/can_the_city_mini_gt_be_a_double.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_off0000db1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 5656 bytes
SHA-256: 5c6e731ef914f3c8c78625485a67662ab69a767d854328597f6477ec49c56e82
font_01_sfnt_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 10484 bytes
SHA-256: 484765585e418faeaf5896e36fcbd2531ad1319269e9e2b0da192145f4e2678f

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