Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb156f5ab2516f33…

MALICIOUS

PDF

76.0 KB Created: 2021-03-24 23:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01f5b5ef3df5df7a0066b45d9924af2c SHA-1: 84e1c8b33c361ca59ca995edfdb37a2e1eaa0ff5 SHA-256: bb156f5ab2516f33201ca5e0788f2ac421cb4926553e658bcdfd894ea5ad6d97
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that redirect to potentially malicious sites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=agric+science+for+primary+school+pdf In PDF document text
    • http://subuxiwubemew.getenjoyment.net/dillon_650_for_sale_south_africa.pdfIn PDF document text
    • http://zuregazezoral.mygamesonline.org/wadapafenukowizifipib.pdfIn PDF document text
    • https://cdn.sqhk.co/jukunobegabe/7Qagcij/12391079094.pdfIn PDF document text
    • http://dressnbuy.com/93862689559nmlc3.pdfIn PDF document text
    • http://lomidal.mygamesonline.org/important_name_reactions_in_organic_chemistry_class_12_cbse.pdfIn PDF document text
    • http://kowuterada.mygamesonline.org/makalah_keberagaman_agama_di_indonesia.pdfIn PDF document text
    • http://nefupanono.mygamesonline.org/yoga_exercise_for_back_pain.pdfIn PDF document text
    • https://cdn.sqhk.co/pozazoji/c0rijge/sultan_the_game_video.pdfIn PDF document text
    • http://mudixefibewab.mywebcommunity.org/dog_man_books_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/KQggpia/39952156850.pdfIn PDF document text
    • http://xugaguf.mypressonline.com/4113436305.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/aiaejia/battle_royale_hd_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/lowimipofevu/jfoqthi/vifanokapomitutitug.pdfIn PDF document text
    • https://cdn.sqhk.co/zodozane/ejhijcI/3411987324.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/adding_fractions_with_unlike_denominators_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/nogegamapagi/f4ghhgd/35518123775.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/75405597472.pdfIn PDF document text
    • http://iqecoportal.ru/59938445489ufn2j.pdfIn PDF document text
    • http://sutezesibopixiv.medianewsonline.com/tixeremuromolelamados.pdfIn PDF document text
    • http://gugolufixa.mywebcommunity.org/wenobuvelogobe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jotudokizer.onlinewebshop.net/tumun.pdfIn PDF document text
    • http://noroved.myartsonline.com/mathematics_books_for_ias_mains.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/bem_adalah.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_off0000eae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE2 5660 bytes
SHA-256: 68e8d8c21e1f67db522055c64c26de86abbc52853f17d01cfba1ac5d29d845e4
font_01_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 10588 bytes
SHA-256: 3eaa390775267fcc8b818729e9493b992d9c2cf0e88ca93fb62d09e93e85953c

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