Malicious PDF — malware analysis report

Static analysis result for SHA-256 7657d75d7256f589…

MALICIOUS

PDF

87.2 KB Created: 2021-04-07 18:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb728703345324992522c980ecee4766 SHA-1: 7a1bd254b8e508a5a1804384646840616608c609 SHA-256: 7657d75d7256f589691913c1d0073aa8b7c33a475a24c841e5e320e2e71bbdea
96 Risk Score

Malware Insights

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

The PDF document contains an embedded URI pointing to a suspicious domain, identified by heuristics and a machine learning classifier as malicious. ClamAV also detected it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to health and calorie calculation, which is a common theme in phishing campaigns. No scripts were extracted, but the presence of external URIs suggests a potential for downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/strik?utm_term=how+to+calculate+calories+based+on+height+and+weight
    • http://zabovawupe.mypressonline.com/breakfast_club_full_script.pdf
    • http://sutivetowit.mypressonline.com/kiragojorinat.pdf
    • http://gukiduwonaxinef.getenjoyment.net/lizifu.pdf
    • http://lapitubemexidi.mywebcommunity.org/health_benefits_of_black_seed_oil.pdf
    • https://vuxulirupam.weebly.com/uploads/1/3/5/3/135346280/3724152.pdf
    • http://delinapod.mypressonline.com/xaxuzo.pdf
    • https://dununatanag.weebly.com/uploads/1/3/0/7/130775655/9dd85.pdf
    • https://dijitisabotiji.weebly.com/uploads/1/3/5/3/135324222/jilodatuterer.pdf
    • http://ramuwesitavoz.mywebcommunity.org/minecraft_windows_10_free_download_full_version.pdf
    • http://zegobudipaju.mywebcommunity.org/arqumedes_de_siracusa.pdf
    • http://kalukoroduro.mygamesonline.org/nikanu.pdf
    • https://sakurulemiba.weebly.com/uploads/1/3/0/9/130969926/vizomujamomulez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_d82fb8e166494906b583960aad8f5b30.pdf?index=true
    • https://uploads.strikinglycdn.com/files/da602af5-00d5-4c4f-8eec-8183bb38a2db/39605687292.pdf
    • http://tavamikilav.myartsonline.com/troy_bilt_tb240_owners_manual.pdf
    • https://uploads.strikinglycdn.com/files/7a9e619f-d754-4330-a7af-07ae6c76d19a/kuzib.pdf
    • https://uploads.strikinglycdn.com/files/28e776e2-138e-4316-a957-e91cc2adb5e9/83121528188.pdf
    • https://uploads.strikinglycdn.com/files/d1d61c4e-df7f-4f6b-9a56-156401cb5863/calories_in_arbys_chicken_cordon_bleu_sandwich.pdf
    • https://uploads.strikinglycdn.com/files/0dd3025a-a3dc-48a0-8449-246c37eb1add/the_princess_and_the_pea_oxford.pdf
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_53c0dfe7ad9c4d24b1f579510822c868.pdf?index=true
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_a4fa4da48ed44b308984da51ea9f3b05.pdf?index=true
    • https://uploads.strikinglycdn.com/files/84755948-ac69-4560-a8e4-70723d5041c7/genowavabixuvudekar.pdf
    • http://wejajesenopezoj.onlinewebshop.net/bihar_si_mains_syllabus.pdf
    • https://uploads.strikinglycdn.com/files/d6eb5b52-2fcb-4928-8a13-bccdd7836368/metodologa_de_la_investigacin_de_hernndez_fernndez_y_baptista_en_su_sexta_edicin.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_off00011699.bin
4b7f45c692ed5ce71cff2c8fa2c5353e447739292fe6cd58e42d8c7c532bd58f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11699 5396 bytes
font_01_sfnt_off000128f5.bin
5929c05689cb2da6436a90d3a56ebe546e31cbaa228de4d9e4530c2beab1a237		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128F5 11144 bytes

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