Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b95337318e60d77…

MALICIOUS

PDF

84.4 KB Created: 2020-11-27 16:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b748ca6f1ce7b56f9dd05bc54fab8441 SHA-1: 98f53997e6d81217d818e89602e449661095d777 SHA-256: 5b95337318e60d779286594323aa7a36c565636d35e306d50aff9fe22c52dc3b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9989

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://trafffi.ru/123?utm_term=horizontal+integration+apush+date PDF link annotation
    • https://dimakevumegipex.weebly.com/uploads/1/3/4/3/134352849/4674655.pdfIn PDF document text
    • https://siminanora.weebly.com/uploads/1/3/4/6/134611077/1309377.pdfIn PDF document text
    • https://demomejisalazi.weebly.com/uploads/1/3/4/8/134869482/1b4796cc34b48.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbe74e7e-7b42-40f1-bad9-b507cd0cd0df/13169018327.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5f859ca-ff9c-4668-9a0e-f252b373ddc1/8534944950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83b240a5-a17b-47e7-8d90-f1d01768af6d/mediacom_valdosta_ga_channel_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbdd41c8-398e-43e0-9885-3488d6e61a0e/76013816762.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/assignment_of_contract_form.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/57590209991.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/mophie_powerstation_xl_user_manual.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55F 6872 bytes
SHA-256: 67e79166eab99d58c51b5605e0c69db1c2aa8670a9cd790b21b3c493144e1e5e
font_01_sfnt_off0000e6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B7 5232 bytes
SHA-256: 37802f3d7af51d1b34dfb752364c9cfe3a8a10c5dc55bae296c075480817b92e
font_02_sfnt_off0000f873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 3184 bytes
SHA-256: f82cc787303c4cf911a48bb2b766871a262316fd7e125435dddb6f5fdb716f03
font_03_sfnt_off000105ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EA 12468 bytes
SHA-256: 5a88586fe9404cf135622e3da0ccd781a240d0c5bcc1ef6699a0711c78b0767c
font_04_sfnt_off00012e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E04 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1

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