Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36e167df36d6fbf…

MALICIOUS

PDF

79.3 KB Created: 2021-04-06 11:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ce1133a5ffd4f1c378209bfb757bb872 SHA-1: 009e38b6f57a4858d9778bc19326be48f2adf42b SHA-256: e36e167df36d6fbf69bb81eec768400708e234ead887d1024b79bb4608c579a1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and ClamAV detection. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated, but the presence of external URIs suggests an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://fokemale.ru/award?keyword=antrenmanlarla+matematik+3+pdf+trigonometri PDF link annotation
    • http://canlisohbetim.net/pemagutu5pz1l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_601c666483b34.pdfIn PDF document text
    • http://bridgecommerce.com/vonazow828r.pdfIn PDF document text
    • http://gunodopo.22web.org/38826713250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479436/normal_600f351c345f5.pdfIn PDF document text
    • http://italysummer.fun/kowabitjaork.pdfIn PDF document text
    • http://lenugaguv.medianewsonline.com/depenetigafurujom.pdfIn PDF document text
    • http://alfa-quest.ru/davazutuvitegignjqwl.pdfIn PDF document text
    • http://it50save.info/how_to_turn_on_hamilton_beach_commercial_ironzj7lk.pdfIn PDF document text
    • http://fofiwafajelerax.sportsontheweb.net/37256527921.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://s3.amazonaws.com/fofeguj/how_to_read_a_poem_aloud_well.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95328d1e-4ca2-4319-b7fa-2b59c8adb82d/zaguzejedajuparaxasudo.pdfIn PDF document text
    • http://vovakupalujum.onlinewebshop.net/winitosiwi.pdfIn PDF document text
    • http://dilepivulibav.epizy.com/wordpress_stylesheet_is_missing_error.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0345cb7a-4343-4c87-86d9-971bef5629e2/why_does_my_dodge_caravan_not_start.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15cefd67-ab32-4fab-bf72-d062f8bad37c/puxisugemofupowubowura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a79e9714-5d03-4346-880e-e5ae2d2bde40/research_journal_of_philosophy_and_social_science.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/readworks_answers_key_the_national_guard.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/zokufidumozerifiro.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/zerejonizefedoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87bc5f71-fb06-4809-bc5b-42ec0b19b12b/17453485128.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_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 5188 bytes
SHA-256: 4bafe098f6adf247693f6d788f5fd304703b25b2eb79d5c93271a84bc7b8e075
font_01_sfnt_off0000fa7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 11968 bytes
SHA-256: a31da76cab8b60a295c5ac223197c8e57258f995dcf546187cf12ea122aeef0f
font_02_sfnt_off00011fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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