Malicious PDF — malware analysis report

Static analysis result for SHA-256 e576287547fb6ff3…

MALICIOUS

PDF

75.2 KB Created: 2021-06-01 19:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fcf0348a7082e1019230bdd6c4022a9 SHA-1: d76b07a7f744e12fe15d6061bb00f3dabd99a113 SHA-256: e576287547fb6ff3d49a130af081f47b58c30bc72466ee7e3a11a95f8a8f7467
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, directing users to various websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The presence of embedded URLs and the overall structure suggest this PDF is designed to redirect users to potentially malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://catamma.ru/pbw?utm_term=composition+of+functions+and+inverses+worksheet
    • https://cdn-cms.f-static.net/uploads/4369914/normal_605c5b5922ccf.pdf
    • https://falojaba.weebly.com/uploads/1/3/0/7/130776150/lixajofopob-kerifu-manug-foxasujuritawem.pdf
    • https://cdn-cms.f-static.net/uploads/4380858/normal_6060ed23e039e.pdf
    • https://vafarisitoguv.weebly.com/uploads/1/3/0/8/130874489/71a62.pdf
    • https://punerumoluzes.weebly.com/uploads/1/3/4/8/134897399/9644262.pdf
    • https://cdn-cms.f-static.net/uploads/4426974/normal_5fe8e18872219.pdf
    • https://static.s123-cdn-static-d.com/uploads/4417309/normal_60b5df01abca1.pdf
    • https://kowelisabames.weebly.com/uploads/1/3/1/8/131857626/ebcc8.pdf
    • https://gelasinez.weebly.com/uploads/1/3/4/7/134763890/4213150.pdf
    • https://mirujodafepofon.weebly.com/uploads/1/3/4/7/134707115/df72a8b.pdf
    • https://midoninojun.weebly.com/uploads/1/3/4/6/134665084/11b4d0ea9b0a.pdf
    • https://cdn-cms.f-static.net/uploads/4374185/normal_60446cea32494.pdf
    • https://nowagomasililub.weebly.com/uploads/1/3/0/7/130775830/8dfc609380ab981.pdf
    • https://cdn-cms.f-static.net/uploads/4378845/normal_5fda48efcd027.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/a96885b0-07b9-44eb-8ae4-3838432f9a95/sap_web_services_tutorial_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/e9e22edd-703b-4dcc-bb6d-2a7b43273589/othello_act_2_scene_1_quotes_and_analysis.pdf
    • http://supatibu.pbworks.com/f/mengubah_ke_word_bisa_di_edit.pdf
    • https://uploads.strikinglycdn.com/files/382769fb-5d19-4bf6-b099-340179027646/moodjuice_social_anxiety.pdf
    • http://lugozamuxika.pbworks.com/f/minecraft_1.0.9_apk_download.pdf
    • https://uploads.strikinglycdn.com/files/1b2961d0-7ac1-47ac-b09f-93f8ab0e2096/how_to_tell_stihl_chainsaw_chain_size.pdf
    • http://refarumiba.pbworks.com/f/55014604355.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9dd.bin
2ffa8ef0d3fa01b3e56ec969a86d7afcca5ac71b08f071449bcebf387428c001
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 5484 bytes
font_01_sfnt_off0000ec71.bin
0b40530daed43dde19ed54db2aaec2fa6b26961f769c2a87a47342bf2a5588d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 10684 bytes
font_02_sfnt_off0001113d.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1113D 4324 bytes