Malicious PDF — malware analysis report

Static analysis result for SHA-256 1374b8a5c0dcd9a3…

MALICIOUS

PDF

81.5 KB Created: 2021-04-05 03:39:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b08174b308920cb39ac7c295be91b025 SHA-1: 7f4a2d1fef8af7eba242f330f5e797384da17af4 SHA-256: 1374b8a5c0dcd9a357b84a42cb6efc0f451c4f54273265d3706cdf678bc63b0d
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'jumiwimov.ru' suggests a phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=ibps+rrb+call+letter
    • https://cdn.sqhk.co/nosimasiv/eijfhc7/comic_stars_fighting_gamesogood.pdf
    • https://cdn-cms.f-static.net/uploads/4451542/normal_602545c253a2f.pdf
    • https://cdn.sqhk.co/mekaxosur/9Ck8uja/jazirimoke.pdf
    • https://static.s123-cdn-static.com/uploads/4495043/normal_5fc7e25ce4cd6.pdf
    • https://static.s123-cdn-static.com/uploads/4368782/normal_5fcbe14e2d3da.pdf
    • https://static.s123-cdn-static.com/uploads/4465690/normal_5ff1b35f51274.pdf
    • https://cdn.sqhk.co/ratufewebu/rgcgfAg/greatest_hits_radio_jingles.pdf
    • https://cdn-cms.f-static.net/uploads/4381318/normal_5fd9fb3f1c6b9.pdf
    • https://cdn-cms.f-static.net/uploads/4368975/normal_6025f64d78a86.pdf
    • https://cdn.sqhk.co/vekudaselux/aheX8hj/world_championship_lol_2019_tickets.pdf
    • https://cdn-cms.f-static.net/uploads/4472501/normal_601cf4a4be67c.pdf
    • https://cdn-cms.f-static.net/uploads/4456676/normal_60436062d71a7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nijudow/xomijilorikerenozakag.pdf
    • https://s3.amazonaws.com/wujixus/installer_android_studio_sous_ubuntu_18._04.pdf
    • https://s3.amazonaws.com/mexesazaxasa/how_to_connect_microphone_to_singing_machine.pdf
    • https://s3.amazonaws.com/fajeloninesitel/magickal_cashbook.pdf
    • https://uploads.strikinglycdn.com/files/6fd834b5-2578-479d-b85b-58a346f8308e/how_to_read_korean_alphabet_chart.pdf
    • https://uploads.strikinglycdn.com/files/4b6edad0-c777-4972-b845-b638fbf7cf1e/85840340796.pdf
    • https://uploads.strikinglycdn.com/files/e499d90a-a66d-4d24-9c05-f6a4370acdd8/64971594309.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001031f.bin
5738df3fce01ca1c43180cb916f7abf2eccdc95610d5e3cbf12adb7e5976e1f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1031F 5004 bytes
font_01_sfnt_off0001142a.bin
dfbe37086ba44bfef5d1b8c79124aa3fe1977ccd8fd06c018d518e8d3d772f11
pdf-font-stream PDF embedded font (sfnt) at offset 0x1142A 10904 bytes