Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7bc90b32c835f5…

MALICIOUS

PDF

67.3 KB Created: 2020-12-18 12:42:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: be8b2d0ab2a16a9bbfdac47e1cf13710 SHA-1: 17ecaf955c57ea497e58535c39dbe17298d8f64e SHA-256: 7b7bc90b32c835f58b62103951bd68208404890c49c6690a4b159ef43a6c659a
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://trafficel.ru/123?utm_term=unblocked+run+3+hacked PDF link annotation
    • https://lifotuvuzaraxur.weebly.com/uploads/1/3/0/7/130775275/zaluvisonagepewevufe.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/3966595.pdfIn PDF document text
    • https://lidafeli.weebly.com/uploads/1/3/4/6/134683499/fofurarunevubi.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/nefagolom/28887410485.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/dallas_cowboys_wallpaper_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/sleeping_pad_r_value_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9c79e53-f766-498f-8cff-f904ccfce320/calculating_voltage_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/medadele/if_the_moon_is_full_today_what_phase_will_it_be_in_a_week.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/23569651337.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/pititofuv.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/vokojexipepobot.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/business_data_networks_and_security.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_off0000ca7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7C 5208 bytes
SHA-256: dd9d86734779a61027d1edbae1c3aacca60032a6aa60ceb3863144e22b9d4f8c
font_01_sfnt_off0000dc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2D 10744 bytes
SHA-256: 9903dee244b1fd52ca72c5cdb5ccd30290d2cac134464354fb180cdb9202568d