Malicious PDF — malware analysis report

Static analysis result for SHA-256 731c08ea3de925c7…

MALICIOUS

PDF

76.4 KB Created: 2021-03-29 04:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d91085e767c20e82413b74571f004606 SHA-1: 2ecaddcf6f0563a09631fe86bf7aa724d0016ae3 SHA-256: 731c08ea3de925c7d33ebfbacf4bc18a29bbae394da2de49832238e3e4fa63d3
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, identified as malicious by ClamAV and a machine learning classifier. The document body, though heavily obfuscated, suggests a lure related to 'data analysis and algorithm notes' to entice users to click the malicious link. No scripts were extracted, but the presence of the external URI is a strong indicator of 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://lozipotod.ru/award?keyword=data+analysis+and+algorithm+notes+pdf
    • https://cdn-cms.f-static.net/uploads/4426545/normal_6019d600a1777.pdf
    • http://pofaduxiruk.getenjoyment.net/advanced_english_vocabulary_list_with_meaning.pdf
    • https://static.s123-cdn-static.com/uploads/4374535/normal_600379af31bc6.pdf
    • http://zezasarasojid.mywebcommunity.org/what_is_the_inverse_of_an_orthogonal_matrix.pdf
    • http://luxuwum.mypressonline.com/detubegalifuta.pdf
    • http://kepukarob.sportsontheweb.net/bururileka.pdf
    • http://ledozikatiresev.scienceontheweb.net/78989798632.pdf
    • http://kifejuja.medianewsonline.com/55641915338.pdf
    • http://pevojatinolotej.22web.org/reduce_size_acrobat_standard_dc.pdf
    • http://remoliwagofaju.mywebcommunity.org/17264943984.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pitaken.onlinewebshop.net/xidefilowide.pdf
    • https://uploads.strikinglycdn.com/files/2f49e366-1c90-49f8-9f85-3bb5cb9738fe/68227101101.pdf
    • http://muwuvago.atwebpages.com/vizinekaxuxujozojuforet.pdf
    • http://watenuzigoxabi.rf.gd/33820186989.pdf
    • http://begafunif.epizy.com/best_football_game_app.pdf
    • http://xejapudef.epizy.com/bollywood_new_movies_2019_full_hd.pdf
    • https://uploads.strikinglycdn.com/files/875b84c2-146e-481f-8b63-0482fcb2aa87/how_to_pack_a_gift_box_for_shipping.pdf
    • http://dirazonun.myartsonline.com/cancer_ward_aleksandr_solzhenitsyn_download.pdf
    • http://favuwipeg.rf.gd/afasia_de_broca_y_wernicke.pdf
    • https://uploads.strikinglycdn.com/files/aecf05ff-d073-4650-8c78-0871482030b4/zopilonu.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_off0000ecca.bin
f0beb2797bde64838f61b02f87582157ebb2516481d03a34ac2e7c619faf6be7
pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 5556 bytes
font_01_sfnt_off0000ff97.bin
73a5c39e57c06b9edecbdeffc51641b5cf784a5384ab8a98eef7f09c2c97f84a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 10696 bytes