Malicious PDF — malware analysis report

Static analysis result for SHA-256 168af5ecf53abd74…

MALICIOUS

PDF

78.4 KB Created: 2021-03-17 14:25:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ba2cc75a0ef6f13516558be309239fa1 SHA-1: a90cd5025f034e862b84ce0f8be4d9cefead55c0 SHA-256: 168af5ecf53abd7496e7317dbabb2068dbc7978b06ea2ef027729390c87bad1f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://dugedepap.ru/wix?keyword=solutions+basic+chemistry+worksheet PDF link annotation
    • https://cdn.sqhk.co/boguzivipel/jZjehho/lupijegate.pdfIn PDF document text
    • https://cdn.sqhk.co/vijasezadida/bhhwjer/love_tik_tok_video_whatsapp_status.pdfIn PDF document text
    • http://ita-bio.fun/like_water_for_chocolate_book_characterssw7tx.pdfIn PDF document text
    • http://vepenuvix.mygamesonline.org/79333374180.pdfIn PDF document text
    • http://zagodutaf.getenjoyment.net/49070419748.pdfIn PDF document text
    • http://mybestchan.online/samrat_ashoka_serial_all_full_episodes_s3vsho.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499999/normal_5ff85aad8816e.pdfIn PDF document text
    • http://4338bacchus.com/ratujukekor5579.pdfIn PDF document text
    • http://xadazobisisim.scienceontheweb.net/55554709179.pdfIn PDF document text
    • http://forkidsshop.online/sejixipupulaxafajupmy32.pdfIn PDF document text
    • https://cdn.sqhk.co/mewuwemiromi/lyeghif/nco_set_b_answer_key.pdfIn PDF document text
    • http://bizowokare.getenjoyment.net/48480557431.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370055/normal_603a9228c411a.pdfIn PDF document text
    • http://jejederepox.medianewsonline.com/80611874784.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/wonojuleboruwogugubiga.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/543bff71-f59c-4273-bbd8-10be4be1eb15/98472160002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63c86ebf-ed5e-4a1c-b0ba-22c866f1c807/danby_premiere_portable_air_conditioner_11000_btu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1debe83f-1431-40ee-ab4d-a40fde853e25/bruce_lee_striking_thoughts_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71a85992-b850-447f-8d2d-7c74f30c5ddf/kemovibodimimura.pdfIn PDF document text
    • http://tuzuxutetug.atwebpages.com/carmilla_gratis.pdfIn PDF document text
    • http://rugoxesoteko.myartsonline.com/devi_atharvashirsha.pdfIn PDF document text
    • http://pefimubis.myartsonline.com/vafokisali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1f39f2e-44d7-4ef4-b859-ba6731043c7a/62934304895.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_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 5540 bytes
SHA-256: fd5fd95f31d8f7c620a9b2cbc5dd933a7113c9f7d0c6044536057c09e33d1869
font_01_sfnt_off0001037e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037E 11628 bytes
SHA-256: c62fb4742a05963bdbccfb02029b5ff903a23161360d289e360e2ed7f90de5f9

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