Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a2e083b2ceb1a6…

MALICIOUS

PDF

80.8 KB Created: 2021-04-01 15:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4b1963c51724bca2e681abcf276c3ecf SHA-1: 7ece063f461514ea0ed0071851dbc7e9becf24c6 SHA-256: 15a2e083b2ceb1a63fac8119b241e1de7083a93d49e5b6dc0464534950e55e37
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/award?keyword=quarter+life+crisis+book+pdf PDF link annotation
    • http://jotusimemirido.sportsontheweb.net/john_oprea_differential_geometry_and_its_applications.pdfIn PDF document text
    • http://miribut.mywebcommunity.org/national_anthem_usa_lyrics.pdfIn PDF document text
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/9172655.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_5fdc43e70a302.pdfIn PDF document text
    • https://ritipovilij.weebly.com/uploads/1/3/4/6/134650849/721272.pdfIn PDF document text
    • http://mekapidi.medianewsonline.com/16420577423.pdfIn PDF document text
    • https://lepekogiba.weebly.com/uploads/1/3/1/6/131637498/wirolujeb_xivebadobed_bavefira.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/why_does_my_torpedo_heater_keep_shutting_off.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465545/normal_5fd936c5035ce.pdfIn PDF document text
    • http://mazikopipovix.mywebcommunity.org/4655080455.pdfIn PDF document text
    • http://tatuxuvoziparu.mywebcommunity.org/how_to_increase_height_by_exercise.pdfIn PDF document text
    • http://fevinoreniwelik.sportsontheweb.net/pdf_split_app_iphone.pdfIn PDF document text
    • https://bafuzonexive.weebly.com/uploads/1/3/0/7/130739369/jufipatabunisi.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/53766400707.pdfIn PDF document text
    • http://rixadixiji.scienceontheweb.net/98385393068.pdfIn PDF document text
    • http://riwalimuj.scienceontheweb.net/xizubuluz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446931/normal_604647b7e8f7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482625/normal_5ffa22cb541bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462730/normal_60511e6cab0b0.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://wipadafefuxasi.onlinewebshop.net/totemogolojuzowosanugoret.pdfIn PDF document text
    • http://kufekisawisewo.onlinewebshop.net/pebowasepo.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_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 5192 bytes
SHA-256: 76f5bafd44f51849e47433fb3bcf918c71971a833b71463a2b0c7ace45fdf68f
font_01_sfnt_off000102d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D0 10412 bytes
SHA-256: 4a23f1e76b26b0c0328b6fbb52f9de52b41ced40b81efc4c7ecc28b5e6754baa
font_02_sfnt_off00012658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12658 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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