Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2cda68de3d987d…

MALICIOUS

PDF

77.3 KB Created: 2020-11-18 23:53:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 88c6b8066fb26d7cd2c4fbd16aacd1cb SHA-1: d0f2b85c9405b705dc4932d9399150af35d59cbc SHA-256: ef2cda68de3d987db9dc323f79c1f3ca22d58d69ce7c778aabcb3eb427440c05
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious or SEO-spam content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The primary malicious URL identified is 'https://trafftec.ru/123?utm_term=tv+show+scripts+to+read', which is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a 'Pdf.Phishing.Trojan'.

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://trafftec.ru/123?utm_term=tv+show+scripts+to+read PDF link annotation
    • https://pasutexovemas.weebly.com/uploads/1/3/0/9/130969198/8029805.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404488/normal_5fb2b018571ed.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/5517718.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417205/normal_5faea4e998a20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380392/normal_5f93b2d074f04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377379/normal_5f8b596a1f437.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503309/normal_5fad65dbb4753.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/nalifij/kirkland_lasagna_nutrition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37f9664f-6d0c-43b4-a30c-c3dfe892a528/scott_middle_school_supply_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a8d02c5-341b-4be5-b3ba-d26d080629b7/93384424981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3ef905a-ed40-4eb1-9bf3-2d3d16f651ad/61912274406.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd87d100-e5fd-4637-8334-1a9f7a8f8e09/dorop.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_off0000e43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43E 4912 bytes
SHA-256: fa8fc3036ddd43812a28a06b3bbd06cf0a208a6f511c61a6cd74cf1b0d4ca8a9
font_01_sfnt_off0000f518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 10868 bytes
SHA-256: 0a3d3b470c2ed2a1ec0825d4e21dbe2624a9e291d71164c29ad688356e7be223
font_02_sfnt_off00011a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A37 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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