Malicious PDF — malware analysis report

Static analysis result for SHA-256 b496041a25431a89…

MALICIOUS

PDF

77.2 KB Created: 2021-03-15 15:08:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: de766a8ec440fde6152acb9ee80850b7 SHA-1: 01fd408cd5906f135aa86209dc149a8b516bdd2a SHA-256: b496041a25431a89c8a37c06f1332b55f3657debcd63447d9cd2f888003ce7b1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary malicious URL identified is https://resalured.ru/strik, which is likely used to redirect users to a malicious site. No scripts were extracted, but the PDF structure and numerous external links indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=kodak+easyshare+m820+digital+frame+white+screen PDF link annotation
    • http://begemotiks.fun/pasos_para_resolver_composicion_de_funcioness4kwq.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/pejug.pdfIn PDF document text
    • http://zarabotok.space/66555451419tfrtk.pdfIn PDF document text
    • http://jushq.club/450131561874sqyv.pdfIn PDF document text
    • http://gixapedotamerow.mywebcommunity.org/how_to_get_a_mississippi_marriage_license.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0c17d2ad-06a2-4efd-9128-26148cac6670.filesusr.com/ugd/44320b_9ea7ff7da1644826a8896d8a8632df1b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4e36e22-c854-4388-820c-51acddd10aea/62138027036.pdfIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_569eeb44ee8b4c7587c276dd957c5974.pdf?index=trueIn PDF document text
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_6fdd85ce0a6b4f4da129361a8b5e1992.pdf?index=trueIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_da44e279233f4c9eb51534205b73f96f.pdf?index=trueIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_a16619d9274a44c1aee289ba2a2054f7.pdf?index=trueIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_a0358523b1b04508bdb0015e9c1a4030.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_83f10ae925974a4883ff990a076e9187.pdf?index=trueIn PDF document text
    • http://rijemow.onlinewebshop.net/sarepimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e29f32-fd2f-4395-8a47-a00ecb4e5da4/kijavetov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0048b983-d339-4d4c-8f54-baadb416f8b4/27211360850.pdfIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_b25661adc29942da810000b52ff7e26f.pdf?index=trueIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_12b134adf2e64d65ad3cb651d0b9aa37.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f70bb7ac-9829-44d8-a32c-fcb1b14bcab4/bevegojobibetaza.pdfIn PDF document text
    • http://tobikinos.onlinewebshop.net/pofogifuwozifuvexixujogus.pdfIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_9c1d3dc123004245807408524a10dead.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 2900 bytes
SHA-256: 68d094faf81d2ea9f62e68ee4e789e40b6192f27e323b9e50c58fbaa8f881837
font_01_sfnt_off0000eb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB80 6132 bytes
SHA-256: d90e0352e3d111fb65b0f1db43d8cd003816bc81388598efbefc64ffe7869d0f
font_02_sfnt_off0001004e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004E 11360 bytes
SHA-256: e02a0fdbc357d717cd11b22c6db82698f0a839d434514890feb727962f0b05b9

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