Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33a49099888bd18…

MALICIOUS

PDF

80.9 KB Created: 2021-06-08 14:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f12007a7df61b6c0b91eebf65115bce5 SHA-1: d66a3e127cf3168b516006b1cd4523c67b623d40 SHA-256: b33a49099888bd1882e711957239e22174f01b393dd8f9ff9326f9b9257ce897
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, specifically flagged as a phishing trojan. The heuristics indicate it functions as a link farm, containing numerous external links, with a notable focus on SEO manipulation. The primary URL, https://laborke.ru/pbw?utm_term=what+is+light+a+candle+prayer, suggests a potential phishing or scam lure. No scripts were extracted, but the PDF structure itself facilitates the redirection to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://laborke.ru/pbw?utm_term=what+is+light+a+candle+prayer PDF link annotation
    • https://moxitamun.weebly.com/uploads/1/3/4/0/134040854/9ea5bf9b46f.pdfIn PDF document text
    • https://bakusiluvusefe.weebly.com/uploads/1/3/5/3/135309983/5532433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451927/normal_60443ac03a0e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443337/normal_5fe63dc32358a.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/zoxusujar.pdfIn PDF document text
    • https://vetexugosopaviz.weebly.com/uploads/1/3/0/7/130738505/7706917.pdfIn PDF document text
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/78e36bb61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488570/normal_60458ed7a20da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://veniwusuj.pbworks.com/w/file/fetch/144490671/mejelafudam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e11fc1-e638-45d2-9e8e-520b7e83bc74/why_is_my_panasonic_tv_blinking_red_7_times.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/024f9520-f311-4b05-933a-5e5584da7cc4/22058469027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c11108f0-2897-422b-a9e1-5b77bd0a37a2/divutazowidateteve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19dbd43f-b3e8-4cad-b36e-5caa0bf5ef09/zokobisugemalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa54ac64-e01f-42f7-974b-e6f5fb51af9e/45676958858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b7c4ea2-d11a-4db9-8efe-587ca7f47e43/nunitomavamob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/639c55e2-95a0-4a55-a497-5f965036dcd3/zibeguzedo.pdfIn PDF document text
    • http://pilujibos.pbworks.com/w/file/fetch/144565848/9625367230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5f51378-e3b9-4c57-b8a3-7d7184d77a0e/how_do_i_program_my_directv_remote_to_my_polk_soundbar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adef143e-7be4-40e8-a21c-7e1210d63d33/modern_car_parking_3d_mod_apk_unlimited_money.pdfIn PDF document text
    • http://paderukut.pbworks.com/w/file/fetch/144685317/jiboxojefokopegusadozo.pdfIn PDF document text
    • http://gabumur.pbworks.com/w/file/fetch/144508107/super_smash_flash_2_unblocked_flash.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87a53f1b-0fef-4165-83d9-38522e34ac1a/como_comprar_en_walmart_usa_y_recibir_en_mxico.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE204 3612 bytes
SHA-256: 815709700977924f8a71c67683eabf9f7aef02d6568fa58f73834618898b6d4c
font_01_sfnt_off0000eef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 5128 bytes
SHA-256: d6f61091022b0738cdc9b8510a21defbf01343cb8f76f1aece3d6f7f9c21fa73
font_02_sfnt_off00010057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10057 11824 bytes
SHA-256: 4cc487a6d5eba64d00b4fdd67440dcd090254c73172f2c230ebe31150632d762
font_03_sfnt_off0001276c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276C 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230