Malicious PDF — malware analysis report

Static analysis result for SHA-256 40fe20597a0bdd26…

MALICIOUS

PDF

92.4 KB Created: 2021-01-01 06:58:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 518aa076886216ab7bfb1648f8c764a3 SHA-1: eba3b7bbc49d21f4b7cc631afa65e57bc1236b33 SHA-256: 40fe20597a0bdd264fdee67bef6cbfbe5697ddad7f8ec7de7e46235382e38965
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning and phishing. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, with one pointing to a potentially malicious domain. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/aws?utm_term=rscit+answer+key+22+april+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418166/normal_5fa0e7ee51923.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468530/normal_5fad4fea0b41c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466408/normal_5fd04b8f78aa3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472188/normal_5fdef83828e66.pdfIn PDF document text
    • https://poxotedodesogin.weebly.com/uploads/1/3/4/3/134305686/wudamul.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
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/7edd435d-c0ae-4be6-afd8-0e521d319d10/displacer_beast_5e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e276e88-6fea-4f4f-a28a-8fe166e5723a/69935531604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/217a191e-5003-47db-8087-f9d3b68573fe/94717878112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/521391a9-0e17-43f0-a0a6-339f14e54aad/46101670981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0abb13e4-de17-4865-b8bf-b126abfd09d9/pipikewipazugujep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b784455b-94dd-4110-bc09-052cae16eeac/pinata_hunter_2_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a064b52-86bc-44ec-b666-1a506d78965a/head_shoulders_knees_and_toes_lesson_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa844077-15ab-4670-93d1-34d478e677a4/avast_driver_updater_free_2020.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
    • 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_off0000e8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 5392 bytes
SHA-256: b7af36cd127a377425a9c2bbb907f2842b4fa6e94c0cd8cad8dce7504ee65ead
font_01_sfnt_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 10924 bytes
SHA-256: c07629f6ba19360e77d349ec4b46680ac3a5b89f208561757412ed4e959550a7
font_02_sfnt_off00012093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12093 16060 bytes
SHA-256: 1018660efa6a1a00280f0dbd6ee9814149b2344b9acf14d98de2cb76d1e712aa
font_03_sfnt_off0001352a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
font_04_sfnt_off0001432a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432A 9672 bytes
SHA-256: e3175ec60accac238c8638c339f4962b41a94de7dc62ecdacd85a15ef4dddc13

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