Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7dc7d6314041f8…

MALICIOUS

PDF

90.6 KB Created: 2021-03-13 19:03:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3114705c1866123c6e63877f7da309fe SHA-1: 0e79e5f7efc10a34e3bfd1e9aec28fccd67ef8bd SHA-256: 4d7dc7d6314041f83239149fd06a4905e792ea6a3dcbb054697497d011a4a4a2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing campaign. The embedded URL `https://mezovuduw.ru/strik?utm_term=how+do+you+know+if+your+tv+backlight+is+broken` is a primary indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://mezovuduw.ru/strik?utm_term=how+do+you+know+if+your+tv+backlight+is+broken PDF link annotation
    • http://mitutepoka.medianewsonline.com/rikalolosekapatapit.pdfIn PDF document text
    • http://xitnet.fun/kumofureluwogapoxuduxigo0nv1.pdfIn PDF document text
    • http://casser.xyz/89233593329y6kd8.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/gibjagf/naruto_ultimate_ninja_blazing_tier_list_pve.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/lapesebuzilalem.pdfIn PDF document text
    • http://sodahub.pro/2_nephi_9_306kkzj.pdfIn PDF document text
    • https://cdn.sqhk.co/butuxolevu/Mjaxsyn/kozilapigufezigozoworig.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/vhhZ9EM/gobble_dash_level_12.pdfIn PDF document text
    • http://neojust.ru/ford_555b_backhoe_service_manualschtj.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/fljhchc/lefawanuzogesez.pdfIn PDF document text
    • http://vizojuzoninunoz.scienceontheweb.net/hoover_power_path_pro_xl_carpet_cleaner_manual.pdfIn PDF document text
    • http://afracheat5.xyz/epson_wf-7510_wireless_setupw8e0c.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/hp_probook_6560b_wifi_drivers_windows_7_64_bit.pdfIn PDF document text
    • https://cdn.sqhk.co/tizuvuwo/sXTicgj/oceanhorn_hack_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_e22a3c47f7df48b691318ab7e6975979.pdf?index=trueIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_ebf1a6a521714803b26f14fbf971977f.pdf?index=trueIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_14f60c6120af49869f092d10b2fdd7ec.pdf?index=trueIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_0eb075dbe4724d21b9c2af5547bc4adc.pdf?index=trueIn PDF document text
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_a2e04ebf688741b5b44f37bd40b5a3ec.pdf?index=trueIn PDF document text
    • http://vekabun.myartsonline.com/taiwan_tourist_map.pdfIn PDF document text
    • https://ecf1b359-4982-44d9-836f-7e6f5fec4aa1.filesusr.com/ugd/da15c8_3a1fc80137e942188914c6ce0147000d.pdf?index=trueIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_05930299f0384ecdae9667b355a72612.pdf?index=trueIn PDF document text
    • https://598a1783-db1d-4ebb-96f5-d3ad23e1e090.filesusr.com/ugd/ae99eb_43b6f0b390624f8a8a2c70243d80e578.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDF 5704 bytes
SHA-256: 05a8cc30f634c526b9355078e3efe27783883f067fb2287241b08acb38a12498
font_01_sfnt_off00011252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11252 2944 bytes
SHA-256: 0bde9cbdda8f6e84ff296b06d08fdfb17ff662038c5ebbde2e247a7f177268f5
font_02_sfnt_off00011e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E94 11744 bytes
SHA-256: 69e964dbabe902ae0ad3efb77d0c83ae36c0665b72b3d43ca65c5d8ef401bd48
font_03_sfnt_off00014672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14672 16344 bytes
SHA-256: 3745d395dffe053ce12bb6e6d543a89fda750690c61e1e786fb35984b58e44e5

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