Malicious PDF — malware analysis report

Static analysis result for SHA-256 8afd25e7814dd326…

MALICIOUS

PDF

81.4 KB Created: 2021-03-10 03:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3c65d1beea11a6540db6c2aed7689a1c SHA-1: fdd8340d2e5f428d967dccc14a8f92e728cb148e SHA-256: 8afd25e7814dd326526b1d5a25eea00b90608c0daf44aedc64c44fcd1ca902a1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm or redirection infrastructure. The document body, though heavily obfuscated, contains text related to 'small log cabin kit prices', indicating a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://maypoin.ru/aws?utm_term=small+log+cabin+kit+prices PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384030/normal_5ffb6ff89c7a4.pdfIn PDF document text
    • https://cdn.sqhk.co/wareberefiz/qGidCJ2/lukirirejojo.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/creative_visualization_book_summary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484609/normal_6013ea2c0cd7e.pdfIn PDF document text
    • http://tozidak.mygamesonline.org/51970333992.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/0pFNihX/toy_of_war_game_download_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382190/normal_5ff69b91bb640.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/3741429783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407070/normal_5fd9f284997b2.pdfIn PDF document text
    • http://biwadevebudorif.22web.org/how_to_hide_the_search_bar_in_chrome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452608/normal_6020aec4f1140.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377697/normal_5fef7e6579d39.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/1gdm8ig/vanilla_ice_cream_sandwich_cookie_recipe.pdfIn PDF document text
    • https://cdn.sqhk.co/tomakaxizo/Ulkx6rk/neighbors_federal_credit_union_goodwood.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/QheNjgm/2834067391.pdfIn PDF document text
    • https://cdn.sqhk.co/vefutifeves/6hfhhci/paris_rex_game_y8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455380/normal_5fce2cbf6db65.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/zofuluzigasoku.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
    • http://lijaros.rf.gd/hp_p3015_driver_win7_64_bit.pdfIn PDF document text
    • http://begosene.epizy.com/marksheet_of_ias_toppers_2019.pdfIn PDF document text
    • http://tuxabatadifu.onlinewebshop.net/77305000840.pdfIn PDF document text
    • http://wuvadofer.epizy.com/bantai_new_song_machayenge.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_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 5348 bytes
SHA-256: b4133181e2c31663f180c44c612d2d43a8f1aac673feae176d2e7f75b5a7a0a8
font_01_sfnt_off00010484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 11428 bytes
SHA-256: c22ce56ac074984853f6aebb8ec5be0319cb3dcac51488a57616c72bc53500d6
font_02_sfnt_off00012a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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