Malicious PDF — malware analysis report

Static analysis result for SHA-256 104f707f45dbb622…

MALICIOUS

PDF

95.8 KB Created: 2021-03-01 17:57:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3e9e956afd07b92ac2e39ac5dc05e6de SHA-1: 8df4e1f5ffae60d9430f1b2fe800e1c1c38c7dd6 SHA-256: 104f707f45dbb622f09950db36f39ed23c23a823e9aa4e8591d20fd2d8e6d661
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 embedded URLs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. The presence of a link farm on disposable hosting and the specific URL structure suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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=movie+review+lemony-snicket%2527s-a-series-of-unfortunate-events PDF link annotation
    • https://viluxesoxumubi.weebly.com/uploads/1/3/1/4/131406714/77ec59f82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461497/normal_5ff5be5feab03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367923/normal_60028ade82862.pdfIn PDF document text
    • https://duvozogol.weebly.com/uploads/1/3/5/3/135314926/lonagijum.pdfIn PDF document text
    • http://dotenipago.medianewsonline.com/jozevuvuvif.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/88593123897.pdfIn PDF document text
    • http://lirinevewafa.mypressonline.com/ruxipabinigunun.pdfIn PDF document text
    • https://tujalulu.weebly.com/uploads/1/3/4/3/134382228/nipibikilewak_xijap_xabenoremi_vumibumudadanal.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/78706459114.pdfIn PDF document text
    • http://folugomobok.getenjoyment.net/spirit_blossom_yasuo_animated_wallpaper.pdfIn PDF document text
    • https://piteselijofer.weebly.com/uploads/1/3/4/6/134608400/bivas_zewitepesunej.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/65387211082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486965/normal_5fd6fa97c2f53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420237/normal_60399b2852cd3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wotidupodugi.myartsonline.com/self_dependent_synonyms_in_hindi.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/xigediwaviwekewalez.pdfIn PDF document text
    • http://nejarisiwudu.atwebpages.com/how_to_use_elgato_hd60s_with_obs.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_off0001387e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387E 5416 bytes
SHA-256: 3fd92e644e1fd7c2e8330fa60a07fb202f8fd81d6822358908cb7c95080b7afa
font_01_sfnt_off00014b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0C 11244 bytes
SHA-256: 12be53073dc4df8e5a59cad8d996e1cead97d6133e803d3da2f7e6149f435fe8

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