Malicious PDF — malware analysis report

Static analysis result for SHA-256 5003f699cae23ae9…

MALICIOUS

PDF

79.4 KB Created: 2021-03-10 06:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4c396f596b063b627914d274a891261c SHA-1: a95090d18bf4c2b8590ba8d0933d1011c20ccfb3 SHA-256: 5003f699cae23ae9a5928b2d7e44e77c88d8b2b159c528983824ae41bb65dff2
66 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or redirection attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to lead the user to a malicious site. No scripts were extracted from this sample, but the overall structure and heuristic firings point to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • 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://xajibur.ru/aws?utm_term=how+long+does+it+take+to+cook+sweet+potato+wedges+in+the+oven PDF link annotation
    • http://winovigamaj.mygamesonline.org/samsung_blu_ray_bd-j5700_apps.pdfIn PDF document text
    • https://wigikeketiru.weebly.com/uploads/1/3/1/4/131406435/wegorilumopewoji.pdfIn PDF document text
    • https://cdn.sqhk.co/xetokive/njgifx7/73377028002.pdfIn PDF document text
    • http://mufosubofamar.mywebcommunity.org/maruti_800_carburetor_diagram.pdfIn PDF document text
    • https://piwutevuxave.weebly.com/uploads/1/3/4/8/134891910/22e7dfb5100.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/ngfv4oM/samsung_members_apk_sammobile.pdfIn PDF document text
    • https://gobebirerelimi.weebly.com/uploads/1/3/4/6/134651667/3349689.pdfIn PDF document text
    • https://xedutorapul.weebly.com/uploads/1/3/0/8/130813372/raxenatoluxakak-kupoxinozogi-nobutaxetuxeg-dumuruxebawari.pdfIn PDF document text
    • http://sepoxudozixo.sportsontheweb.net/ap_3d_studio_art_concentration_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/jagjg6C/skylanders_imaginators_xbox_one_download.pdfIn PDF document text
    • http://jukojadijomefar.medianewsonline.com/fopibewoberalidegafobe.pdfIn PDF document text
    • http://benivosefemiza.medianewsonline.com/bible_niv_download_free.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/40148749903.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://megigezorozo.atwebpages.com/xejubaxegun.pdfIn PDF document text
    • http://nukivamo.myartsonline.com/gusutiv.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/49805005343.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/82960129596.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/windows_xp_boot_usb_iso.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/what_is_the_best_alexa_for_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/bobcat_709_backhoe_mounting_brackets.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/32580457141.pdfIn PDF document text
    • http://zerowegujij.onlinewebshop.net/gomoporumesaruwo.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/70018424333.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 5416 bytes
SHA-256: 1667b9d4c5bdbd2bd330f120c26f69b988cd4e2b4fb3cff599419c11dbadb783
font_01_sfnt_off00010887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 11072 bytes
SHA-256: 514d304fe81f6702d561bd8806aeda9b0e1a0b348ac7e5fa2fe15a92c932294b

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