Malicious PDF — malware analysis report

Static analysis result for SHA-256 525f4df73837a1d2…

MALICIOUS

PDF

82.7 KB Created: 2021-03-22 22:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 47e30201b211514337f31d83b7e41033 SHA-1: b5964878972ea8dd0b9d45c14501048f17155f5f SHA-256: 525f4df73837a1d237feb16151024c5280c8ececa7524fac9747fba82d1c301d
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains multiple heuristics indicating malicious intent, including embedded invisible links pointing to suspicious domains and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://lozipotod.ru/strik?utm_term=the+son+of+neptune+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460706/normal_5fe69e38bd17d.pdfIn PDF document text
    • http://tixshopclub.fun/bdo_gathering_xp_guidemi39a.pdfIn PDF document text
    • http://levantemosaic.com/michael_vey_book_3_summaryz0ioi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417137/normal_5fdb2e7470315.pdfIn PDF document text
    • http://g2am2e.xyz/32567782169y4sm.pdfIn PDF document text
    • http://complerbnp.com/blind_man_s_bluff1n5qs.pdfIn PDF document text
    • http://vbruti.site/sindh_high_court_reported_judgements2wsci.pdfIn PDF document text
    • http://stonersfranchise.com/how_to_be_a_good_public_relations_officernan2w.pdfIn PDF document text
    • http://warixedivukinat.mygamesonline.org/introduction_to_data_science_rafael_a._irizarry_solutions.pdfIn PDF document text
    • http://vezerfa.xyz/texas_instrument_ti-30x_solariys18.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/kokupizinj0o7.pdfIn PDF document text
    • http://pc-remont.website/vabobigavizonefict0nw.pdfIn PDF document text
    • http://martakkord.ru/jobogoxorexc8df4.pdfIn PDF document text
    • http://mokenolovulonom.medianewsonline.com/mumex.pdfIn PDF document text
    • http://fegokodelaxen.scienceontheweb.net/sijepamumezetuvojuga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sipanokule.onlinewebshop.net/buxogefowo.pdfIn PDF document text
    • http://bejanifezilo.atwebpages.com/26127150120.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/torote.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/food_safety_net_services_phoenix_az.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/wukemonitawadalilo.pdfIn PDF document text
    • http://timojodabemisux.myartsonline.com/63811122900.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/how_do_i_change_my_brother_printer_from_usb_to_wireless.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/wupojizizeduxixup.pdfIn PDF document text
    • http://kaloruligot.onlinewebshop.net/xexirez.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_off0000fac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC7 4572 bytes
SHA-256: 047415c0b1488f6bb1d1b42fbb0988f2a64fc2b6aa11842ce9bd590ac616f72b
font_01_sfnt_off00010a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A48 10736 bytes
SHA-256: 4876eb55656cdaf0cd8ff03f6b943cc95e3f74e3a0bee18f04eda1b95d786237
font_02_sfnt_off00012f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F25 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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