Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ca05d50433bb39…

MALICIOUS

PDF

77.1 KB Created: 2021-03-30 18:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a0a175fb0da0534b230797d25e911d56 SHA-1: ef744315fe19704bbe5b79bf40dc3e57990b44af SHA-256: 40ca05d50433bb392b585f53883d18e29e049cbdc0a5433a39e1ef982f2372f4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple external URIs pointing to potentially malicious domains, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the ML classifier's high confidence score. The document body, though heavily obfuscated, suggests a lure related to educational materials, aligning with phishing or malware distribution tactics. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/award?keyword=silabus+osn+biologi+sma+pdf PDF link annotation
    • http://autocredit.moscow/buzog50dzc.pdfIn PDF document text
    • https://cdn.sqhk.co/mutuwatu/eia5XMo/super_games_inc_amazon.pdfIn PDF document text
    • https://dagigofeno.weebly.com/uploads/1/3/4/8/134887245/383027.pdfIn PDF document text
    • https://cdn.sqhk.co/vilomikov/jh3KAtU/easy_cake_recipe_without_oven_and_beater.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385030/normal_5fda5cf1ac4aa.pdfIn PDF document text
    • http://goldstein.berlin/wobixepegetegogex6wekl.pdfIn PDF document text
    • https://wifuduwelu.weebly.com/uploads/1/3/2/8/132814355/fusaso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418590/normal_5ff362167195c.pdfIn PDF document text
    • http://ritual-venki.online/super_mario_3d_land_welt_2-4_sternenmnzenyp7bn.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/alesis_dm6_drum_set.pdfIn PDF document text
    • https://tuzebomutiwok.weebly.com/uploads/1/3/1/3/131398369/zivovazubire_towuketalefoz.pdfIn PDF document text
    • http://kind-insta.site/mack_e7_cranks_but_wont_starta5fbs.pdfIn PDF document text
    • https://gilemana.weebly.com/uploads/1/3/5/3/135319463/navulifuwufix-ridum.pdfIn PDF document text
    • http://tusiteguluvora.getenjoyment.net/dokisevowanagotu.pdfIn PDF document text
    • https://vawuzusafut.weebly.com/uploads/1/3/4/8/134863851/wevidizozejig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490752/normal_602934933dd9e.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/6jbatM7/transport_tycoon_fivem_hack.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabejanaboz.atwebpages.com/woxufosupopelajimulamabo.pdfIn PDF document text
    • http://livirava.atwebpages.com/play_a_game_of_chicken_meaning.pdfIn PDF document text
    • http://fazaburifug.myartsonline.com/angularjs_tutorial_for_asp._net.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/sirigikuzakifolukigivu.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/29175357918.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/84695504694.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/2002_f150_running_lean_code.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/adobe_flash_professional_bagas31.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_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 5508 bytes
SHA-256: cdab1a0653bde6b915d30e363b04e3add13ffcc1d20cf26b956f7d32b908f45d
font_01_sfnt_off00010429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10429 10248 bytes
SHA-256: 78e7aebaedb6faf51cf2fb1c0c18040f416b3f3922c5513775eede04703d620f

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