Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2d480bb52f8b6af…

MALICIOUS

PDF

78.3 KB Created: 2020-12-15 14:09:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 93beadc72ebc991345fdcb9335f4c7aa SHA-1: 15d164a22e6c9fe87822536f44ac6c6b08c11004 SHA-256: e2d480bb52f8b6afb000ed01b6e520aad0029cfabc1d31798be69ffd6c1fedfc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the presence of a mass external PDF link farm, with the primary malicious URL being traffsset.ru. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the link farm heuristic suggest a phishing or SEO spamming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/aws?utm_term=possessive+adjectives+worksheets PDF link annotation
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/tizedeniluxiz-gefowigujotubu-senunomikale.pdfIn PDF document text
    • https://bolififona.weebly.com/uploads/1/3/4/3/134316640/26d8faf23bd.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://static1.squarespace.com/static/5fc0e88b8139af0376454bd0/t/5fc1b4e1f81c9a2a0ce1d334/1606530274216/gawezuvikodoku.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f186bda9c57a97be6d6b/t/5fc1738d9ee0f32b8789e0d4/1606513549741/16207064096.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5778f405d5340f3487ee4/t/5fc6d2601d689b68bf889172/1606865505823/kinagejugapovosam.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe02c03485235c868bec0d/1606288065351/bao_thang_mo_rao_vat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e226e05-8f86-48db-8340-41dd1071259a/how_many_neutrons_will_chlorine_have.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf4371491241adc44d76c/1606218807789/moong_dal_soup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28c27803-7b95-4097-bb56-bac83896a751/humble_texas_isd_tax_office.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2f4402e537a05ef168230/t/5fcb314aa3bc3d19152abef2/1607151947325/sajojuzevudiwarutaluvadaw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1bc471452f90b7feb30c6/t/5fc44201e6d49a06bb19d17b/1606697475117/watch_night_prayer_points.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfff2111f6a4198480a438/t/5fc3426b3c6ccf69f3c7c654/1606632044022/tinder_gold_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2117108-d06d-44f7-8ec5-1980e3b697eb/40564075220.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc13e7011f6a4198487f639/t/5fcb35a926a2be7f6de0bf2e/1607153066518/zusom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8b0db07-cfde-4559-a6bf-17443d459a86/figurative_language_worksheets_middle_school.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_off0000e7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B5 4968 bytes
SHA-256: 10e1a7999a8f5c8a53f09ffa4f63dae510891a8fd266acac84c3301d46eb5eb3
font_01_sfnt_off0000f8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 10872 bytes
SHA-256: 865dcb11594aaee30e5c60a618f29c7f170a0ea132bf345263bf94c04855dbbc
font_02_sfnt_off00011dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD4 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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