Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa39edf03f6ccbe6…

MALICIOUS

PDF

130.0 KB Created: 2021-04-19 12:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a12e1a0eda9e718e826423411d01a114 SHA-1: b627af6faae522951cb544a61f1f097d7988c036 SHA-256: aa39edf03f6ccbe620ef127214f2b44f08e8fc516cff8e65a4ea2065be642877
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though partially corrupted, suggests a lure related to a popular game series, directing users to external URLs. The presence of numerous embedded URLs, many hosted on disposable domains, further supports a phishing or redirection scheme.

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://seumenha.ru/strik?utm_term=what+is+the+dark+souls+series+about PDF link annotation
    • https://cdn.sqhk.co/liregevo/jihaYgh/country_music_singers_died_2020.pdfIn PDF document text
    • http://msertis.xyz/rhapsody_of_realities_august_2020_free_downloadxo2lm.pdfIn PDF document text
    • http://jusapp.club/graph_isomorphism_problem0w67l.pdfIn PDF document text
    • http://airbin.top/kaxekuxjdk8.pdfIn PDF document text
    • http://tubesebove.medianewsonline.com/bissectrice_d_un_triangle.pdfIn PDF document text
    • http://befujukipepejem.mygamesonline.org/jotoputaloxevepekopilobu.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/1ihJji5/yellow_shop_vac_filter.pdfIn PDF document text
    • http://lakegefufen.scienceontheweb.net/warm_bodies_film_completo_streaming_ita.pdfIn PDF document text
    • http://nakalabaxis.mywebcommunity.org/kenenona.pdfIn PDF document text
    • https://cdn.sqhk.co/gizivapejoko/phcdBjc/20065722108.pdfIn PDF document text
    • https://cdn.sqhk.co/butemobe/jagjjeo/olympics_2016_medals_badminton.pdfIn PDF document text
    • http://lubevos.scienceontheweb.net/is_headphone_zone_legit.pdfIn PDF document text
    • http://kyrgyztours.com/how_long_do_you_fry_a_turkey_in_a_butterball_electric_fryermgy6e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kopolug.myartsonline.com/51426370588.pdfIn PDF document text
    • http://titugol.atwebpages.com/78625506676.pdfIn PDF document text
    • http://batapijas.myartsonline.com/xunuzusoxovaki.pdfIn PDF document text
    • http://dubanexotokegel.myartsonline.com/tunedifel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9da1c210-267e-4ee5-8254-09e250084c58/guxanen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ecddf47-5022-4338-90ed-03e8eb1a3364/zerutenavikiwematawamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53b9ae4f-37c7-487a-93f0-8357603a8b93/what_is_deterrence_in_capital_punishment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78e7d5c1-a6aa-4410-87eb-e7698896377c/samsung_note_3_launch_date_in_malaysia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d9ba94f-23b9-4596-9ea1-929e18b7f169/polanyi_m._1958_personal_knowledge.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_off0001a2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2C1 7744 bytes
SHA-256: ae3586d44a48901a780dc16bf1cf57dd9bb2be62eff24761980e87587f7f1db7
font_01_sfnt_off0001bd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD4A 5132 bytes
SHA-256: a91b092fc25ebfd3325207b495f1e3fc65f688602e3ba780f83809a1795ce78f
font_02_sfnt_off0001cebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEBF 12540 bytes
SHA-256: de893d91678718f4c64a7c2df449cd83a955990efc41dae6a4682fcfae65c139

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