Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18bf0badb291038…

MALICIOUS

PDF

84.9 KB Created: 2021-05-10 16:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8bc83cd066261ab6a61bc71d1bb60288 SHA-1: aa478f763c66144461f4d3b43b9446cef1e4b4d9 SHA-256: d18bf0badb291038943b5ca0d41dfb6d5019c1cc5d6a28f116856db3d383984e
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of numerous links to potentially disposable hosting and the specific heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=starship+hop+date In PDF document text
    • http://sumapewub.getenjoyment.net/salin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471985/normal_5fc6bd43a3ca5.pdfIn PDF document text
    • http://watogoda.mypressonline.com/68846135546.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/the_worst_mistake_in_the_history_of_the_human_race_article.pdfIn PDF document text
    • http://nelilovodik.scienceontheweb.net/vasabetazenuxux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_6060de2b1c723.pdfIn PDF document text
    • http://kemamibuke.mygamesonline.org/dunupivagimeferigixiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460694/normal_5fc8de066d1f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474457/normal_5fff138a9f893.pdfIn PDF document text
    • http://gedadekenoz.mywebcommunity.org/protein_synthesis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486213/normal_605dcfc83a6e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7dd948c-a45d-486b-aa2f-c338ca55f8e0/mamebef.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/fumuf.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/movorujoxiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/399d3c97-5d17-435f-9090-4a87e70452b0/icom_746_pro_repair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a3fd41f-fd2d-41a4-a82f-77008b06ddd9/ingredients_to_make_your_own_playdough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7de15d66-7e84-4a1e-b235-c5d444f5a0d9/gujowodowomer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67d7454e-d6b3-4a0d-b657-df834f0ae004/how_to_write_a_conclusion_for_an_analytical_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/712eb228-2ccc-4bc2-b311-d463dbae7a82/48715905633.pdfIn PDF document text
    • http://bibezakomi.myartsonline.com/hernan_cortes_segunda_carta_de_relacion.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/early_signs_of_ra_in_hands.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/23087822287.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4be0196f-7760-48fa-bacd-56c0908e5478/neverending_story_dragon_tattoo.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_off00010d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D47 5120 bytes
SHA-256: 84b09fd8beb38b4e54fd2635a8e0a0e220d4d399ce833fcbee209e9bc7c6f3a3
font_01_sfnt_off00011ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA9 11660 bytes
SHA-256: 583b345a5fbe167ea166c55fbc9aceb537a8346532ec21ad749cc5b533074251