Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99bc16f003e9b66…

MALICIOUS

PDF

76.1 KB Created: 2021-03-27 22:05:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8f1de8da8822161a90d7ac3f4016f50 SHA-1: d7af708ac6990664aa4be3fbe469ba0e1ac66bd9 SHA-256: f99bc16f003e9b66cd5f1a9e11aedd8e84eec83cc8fb4e8de3b6d76f816b04b2
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, one of which is `https://crophysi.ru/award?keyword=anomaly+detection+with+robust+deep+autoencoders+pdf`, suggesting a phishing or malware distribution attempt. The presence of external URIs and the overall detection score point towards a phishing attack designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/award?keyword=anomaly+detection+with+robust+deep+autoencoders+pdf
    • http://bajigesupin.iblogger.org/war_of_the_worlds_watch_online_with_english_subtitles.pdf
    • http://jabilevij.mypressonline.com/mathematics_for_machine_learning_deisenroth.pdf
    • https://static.s123-cdn-static.com/uploads/4474465/normal_5fe49ffc9c9db.pdf
    • https://cdn.sqhk.co/senuziker/ht8SIgg/72749494782.pdf
    • http://pubgucbayim.com/tilusitepufowujelowowilans5mx.pdf
    • http://bosuxezaxad.mypressonline.com/larumivapuwedibabenilix.pdf
    • http://tronreserve.online/ccna_module_2_final_exam_answersfxcr0.pdf
    • https://cdn.sqhk.co/tunaluvum/gihjugc/potogejodewekodivajimik.pdf
    • https://cdn-cms.f-static.net/uploads/4465565/normal_5fd2cf7fa4a60.pdf
    • https://static.s123-cdn-static.com/uploads/4447640/normal_5feecb20d3f51.pdf
    • https://cdn.sqhk.co/bigulikexupa/jmVy0ND/.pdf
    • https://cdn.sqhk.co/bevoroxur/hmjg2hg/how_to_make_marvel_logo.pdf
    • http://zekojotewakugag.mypressonline.com/salimax_systems__controls_engineering.pdf
    • https://cdn-cms.f-static.net/uploads/4375518/normal_605ba883a6534.pdf
    • http://nesobaka3.xyz/47328959119p9e5w.pdf
    • https://cdn.sqhk.co/batumozi/dxeheia/butajixad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fekiboxupikus.epizy.com/57341427786.pdf
    • http://davinawoguzag.atwebpages.com/star_wars_ffg_unlimited_power.pdf
    • https://s3.amazonaws.com/bejexe/37082495226.pdf
    • https://s3.amazonaws.com/wegemebufojafak/90986873985.pdf
    • http://puzasapexuwuju.epizy.com/88507301765.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_off0000e33a.bin
bb330db6f7a7ccd4a5fc74ab266889c84727c4832878e478815443d405337a61
pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 5716 bytes
font_01_sfnt_off0000f699.bin
055ee5468982e29bde7c2738ce5beed4a99a24e886b9fb56008ab87bd013657d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF699 13668 bytes