Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4312ce9e8f7412f…

MALICIOUS

PDF

80.3 KB Created: 2021-03-23 04:11:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 844d0896ee60e55fa94caf9499cc6353 SHA-1: 26dd2bea4353695c9d08c895175e17b9342f7393 SHA-256: a4312ce9e8f7412ff1f07602410675446b2fa3f431fa6953c24b1c6ef14fd26c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=how+to+answer+short+answer+questions+apush PDF link annotation
    • https://cdn.sqhk.co/kurotevu/2ij6Jig/ice_cream_cone_calories_mcdonalds.pdfIn PDF document text
    • https://cdn.sqhk.co/vudupapuj/i5afhaH/36513070583.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/gjIhjHr/vamilekitikew.pdfIn PDF document text
    • https://rezusoroporinon.weebly.com/uploads/1/3/2/6/132695427/sopukubaz-ziloda.pdfIn PDF document text
    • https://tifomuzaki.weebly.com/uploads/1/3/1/1/131163977/634160.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabudoxuwa/igfggia/66203922489.pdfIn PDF document text
    • https://cdn.sqhk.co/nukunudakiju/HbggNRr/carnival_city_hotel_rates.pdfIn PDF document text
    • https://cdn.sqhk.co/razefudixid/gihyEgh/black_lightning_season_1_episode_12.pdfIn PDF document text
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/19fceb822c2d4f9.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxukulalodi/drGpwgf/nail_salons_open_now_during_covid_19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_60276a2ea42d5.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/QvrgfCn/dujixirirus.pdfIn PDF document text
    • https://fegajasun.weebly.com/uploads/1/3/4/5/134502742/kifasi.pdfIn PDF document text
    • https://cdn.sqhk.co/kapapomabu/9sgAKje/14447098503.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/jejh7ie/55157872920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422371/normal_6022eb3706390.pdfIn PDF document text
    • https://salobomuxalevi.weebly.com/uploads/1/3/1/0/131070078/2702273.pdfIn PDF document text
    • https://derigogo.weebly.com/uploads/1/3/4/0/134017063/e7e09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388833/normal_60591943ca8ec.pdfIn PDF document text
    • https://kekageguva.weebly.com/uploads/1/3/0/7/130776826/9e60e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_36075221e63a46d2880922c805ff9c16.pdf?index=trueIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_7c092bef7e9a404db4ab881a66ef8fd3.pdf?index=trueIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_791ec9a6f4d24f2f9cc0e9aca7441ec9.pdf?index=trueIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_dc654aa011dc422cbb280f18dcf34f1c.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6F 5052 bytes
SHA-256: b1fc8200924035ecd6698b19a0071b185c043fed821230d826d18f631e68d7df
font_01_sfnt_off00010cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAB 11380 bytes
SHA-256: 82524a5f75d5bca56b79ee09c74f5aca46b994f8fbb6c5fb40f028eb90307342