Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4278706c9a0bf83…

MALICIOUS

PDF

831.5 KB Created: 2021-03-19 05:56:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b224ea64f6fac4f909071bfa6eb952e0 SHA-1: da69e44f85a2a5db3360ee635cefd8aba2efc510 SHA-256: d4278706c9a0bf83ce10f0dba06aad8c57c687128f14fd5fe84f9f523602465a
136 Risk Score

Malware Insights

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

The PDF contains a high-severity heuristic indicating it's an SEO redirector link, likely for phishing, pointing to a URL that mimics a search result. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9557

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://pelibifir.ru/wix?keyword=ff14+bone+chip+location PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462036/normal_601c60883d9b0.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwinoxaxava/Jjdjehd/county_recorder-_clerk_s_office_san_francisco.pdfIn PDF document text
    • http://dasiwujupuna.sportsontheweb.net/tennyson_poem_ulysses_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/8Highg2/47319423991.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465565/normal_604fac2ff2e84.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/regoruwomawabala.pdfIn PDF document text
    • http://sunuzajiwexo.22web.org/what_are_some_management_skills_to_put_on_a_resume.pdfIn PDF document text
    • http://waduresiwiboba.iblogger.org/75489914434.pdfIn PDF document text
    • http://gavokofubafixi.getenjoyment.net/epidemiological_transition.pdfIn PDF document text
    • http://fanilobepewe.sportsontheweb.net/wifadizutaxiwososale.pdfIn PDF document text
    • https://cdn.sqhk.co/kugugofawaz/jf6ibhc/juventus_pink_jersey_authentic.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
    • https://uploads.strikinglycdn.com/files/d370b77d-a8b5-4735-a425-becc12f12c9d/44581489249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d9262b-0ccb-43ea-a620-c65f0cc0efbb/why_is_my_linksys_router_blinking_green.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3309e17a-8540-4ce8-bb04-0f6ee0470d3e/this_sex_which_is_not_one.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e135455-7c16-4ca5-b3d5-15980b24d8f1/repigugumezituk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1975f2dd-13d1-437a-82c5-f2fa7ca3e23d/60238928467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6912e007-78f4-4b96-92a5-585ec83d838e/nancy_drew_season_1_streaming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58f31da1-bf1e-4924-94e3-3d11560a2932/delopefalavuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22b6406c-568b-4bc0-aa39-f450fee8059f/zoletupemavezelepage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45116182-3476-4b8f-b0bf-14296f0f3d24/que_es_educacion_fisica_importancia.pdfIn PDF document text
    • http://bikilut.epizy.com/videocon_d2h_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67cc3f9c-bd76-4dc5-82d2-f59d01cd1336/624647670.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000ca20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA20D 4852 bytes
SHA-256: 1be2c69025d16f1d1d0fce985ac5d49fd3a09c2001a8849b3fbe0a0712c6b7f6
font_01_sfnt_off000cb287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB287 14600 bytes
SHA-256: c7ddbdeb4d4d97b8e0c764e043dd67fd389899ebe4465168bc259c781c66e3b1
font_02_sfnt_off000cdf97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF97 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378