Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3dc18a188dc92e1…

MALICIOUS

PDF

86.8 KB Created: 2021-03-14 18:28:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 277a5d47bee5d763c97fff930e88913d SHA-1: b5b6028b262c973be2f65f5d7945d84038795ea1 SHA-256: e3dc18a188dc92e192d208cf48ac72e136ab62f2fbaddc957875191aec96377b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/wix?keyword=biochemistry+review+packet+answers PDF link annotation
    • https://cdn.sqhk.co/dufukeraj/3EagfnG/antihero_skateboards_t_shirt.pdfIn PDF document text
    • http://fomijegi.mypressonline.com/apache_tomcat_7_tutorial.pdfIn PDF document text
    • https://xufanipup.weebly.com/uploads/1/3/1/8/131856619/jokunilagazeku-kaduxeti-kiwudasivasudur-fovezuje.pdfIn PDF document text
    • http://sberbank.services/tikozosopuxakirodateas016.pdfIn PDF document text
    • https://cdn.sqhk.co/jibezilesu/ePdhaVu/zombie_apocalypse_paintball_hayride_nj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413465/normal_60479589b93bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443574/normal_5fd63d4d4935f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447885/normal_6035a4d3412b4.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/jgiBzic/guess_the_emoji_movie_level_7.pdfIn PDF document text
    • https://voxipomawo.weebly.com/uploads/1/3/1/3/131379395/jotugigilulida.pdfIn PDF document text
    • http://kubosikavudux.mygamesonline.org/3_waves_of_feminism.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489993/normal_5ff3c0876f628.pdfIn PDF document text
    • https://xubakoveg.weebly.com/uploads/1/3/5/9/135967212/loxevupakojed-rewuvusedixixa-meveziwixi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390371/normal_5fe2d8892adca.pdfIn PDF document text
    • https://werirubiteda.weebly.com/uploads/1/3/5/9/135972418/josazimunuseg-xewaredez.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/dU8jiOg/vasonukeniziremosefewona.pdfIn PDF document text
    • https://cdn.sqhk.co/fimirexuf/jhhiie9/luvonalumuw.pdfIn PDF document text
    • http://netzamka.ru/catecismo_de_la_iglesia_catolica_descargarp2rx0.pdfIn PDF document text
    • http://quickpapp.online/icom_portable_aircraft_radiok725f.pdfIn PDF document text
    • https://cdn.sqhk.co/tigufarejeti/UDesheK/where_s_my_water_game_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuroli/igN9gfX/damotifapefimexuliki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vilumepidiwego.myartsonline.com/do_you_believe_in_magic_in_a_movie.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_off0001178d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178D 5508 bytes
SHA-256: 02a34f48e7e80ff4dc92e646781b2e27a656a130bfe467d313fed85efea31ca8
font_01_sfnt_off00012a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A39 10440 bytes
SHA-256: f1fa984d65bfff8b1ca0e5dc84060298de2ade72a6506f2dc1df39ed94988690

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