Malicious PDF — malware analysis report

Static analysis result for SHA-256 519bb1bf90145f97…

MALICIOUS

PDF

75.0 KB Created: 2021-03-29 23:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60435b3ac94b50a8ebc364e619c32f60 SHA-1: 9e0352f3bd929d2ed98357590e19c976ef8fb5a4 SHA-256: 519bb1bf90145f97a88d609925b8e9e756469755c1081143268045d7380aae6e
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL pointing to a suspicious domain, identified as malicious by ClamAV and ML classifiers. The document body, though heavily obfuscated, suggests a lure related to 'mathematical modeling', likely intended to trick the user into clicking the malicious link. No scripts were extracted, but the presence of an external URI and the high confidence detection indicate a phishing or malware distribution attempt.

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://jacksth.ru/award?keyword=elementary+mathematical+modeling+pdf
    • https://cdn.sqhk.co/xumesapaxoku/hggfhh3/can_t_buy_on_ebay_with_paypal.pdf
    • https://cdn-cms.f-static.net/uploads/4412165/normal_5fd27deb873f1.pdf
    • http://dilijox.22web.org/mozulakitivitodogi.pdf
    • https://cdn.sqhk.co/mekurapiw/ggifnjc/archery_target_foam_density.pdf
    • https://static.s123-cdn-static.com/uploads/4462379/normal_5ff5cc70a9318.pdf
    • http://immorta-cross1.club/kidezax5dyu.pdf
    • http://mon-cmbretagne.com/tanadijefakodirokafo8hdn4.pdf
    • https://cdn.sqhk.co/dukizukijire/Ohj9Ajb/trending_videos_news_2019_showbiz.pdf
    • http://faceskinagainbeauty.xyz/84435201311zp6bq.pdf
    • http://amsidisi.xyz/40990371597j9nua.pdf
    • http://peskomment.ru/18060593636ph9u0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/geraromu/pharmacy_technician_university_final_exam_answers.pdf
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_d496e1705c9c4f249c45c53ffab46a91.pdf?index=true
    • https://s3.amazonaws.com/jazamerijekufol/metformin_500_mg_tab_leg.pdf
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_642e58b0ccb94f91a89bada879669f2d.pdf?index=true
    • http://jimibidubarabus.epizy.com/73165505780.pdf
    • https://s3.amazonaws.com/najipavez/mumojadugixafogona.pdf
    • https://s3.amazonaws.com/ginutu/60523072825.pdf
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_3633108f7aae418e9badc46ac2187a5a.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec5f.bin
45b8f9ea3c604580628a3baa5ec40f43a99fb8428c28f5f66d5b010a750969c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 5448 bytes
font_01_sfnt_off0000fecd.bin
1f3bd3b0ebd7328b48ca565e860e4cf2096e5ae48fe368a6906fe41a8b771cdf
pdf-font-stream PDF embedded font (sfnt) at offset 0xFECD 11816 bytes