Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef8452c971a5e2d…

MALICIOUS

PDF

73.6 KB Created: 2021-02-10 22:21:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 21f2d140f9290499b91aa2d855d76b03 SHA-1: 78a4a78cc608c3eb32f0688acc40580eb9d7cea2 SHA-256: 2ef8452c971a5e2da069e76385ab4f62a92aca8d69342ac8f3fc138006b409f1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV both flagged this file as malicious, with ClamAV identifying it as a phishing trojan. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a 'Lavazza espresso point cleaning kit', indicating a potential lure to disguise the malicious intent. No scripts were extracted, but the extensive use of external URLs points towards a redirection or download mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/123?utm_term=lavazza+espresso+point+cleaning+kit PDF link annotation
    • https://degusatujetuz.weebly.com/uploads/1/3/0/8/130813325/vubowisupu_gozifogotorelit_tosomiwilot_gudewafavitotor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409113/normal_5fcd3ac643f80.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/cartilage_and_bone_histologyqorcf.pdfIn PDF document text
    • http://nakanilo.club/forofdrzz0.pdfIn PDF document text
    • http://zhigina.ru/biochemistry_practical_viva_questions9q19u.pdfIn PDF document text
    • https://zavitakeji.weebly.com/uploads/1/3/4/9/134904790/2428b8509eb3b9.pdfIn PDF document text
    • https://cdn.sqhk.co/vifejoneses/jghfEgh/1884186596.pdfIn PDF document text
    • http://swast-group.website/21582428594vkhyl.pdfIn PDF document text
    • https://torovuzexas.weebly.com/uploads/1/3/2/7/132710592/gazalixubux.pdfIn PDF document text
    • https://bunivuwavimi.weebly.com/uploads/1/3/4/7/134706582/d154a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369329/normal_5fe526ed19331.pdfIn PDF document text
    • https://cdn.sqhk.co/forexidof/hjctO43/word_connect_game_free_download_for_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428078/normal_5ffec070605b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493589/normal_5fecf8719fc77.pdfIn PDF document text
    • http://seamanygau.best/winny_earn_cash_moneykrzev.pdfIn PDF document text
    • http://vinograd.io/7423246003nh6y5.pdfIn PDF document text
    • https://minizejemeroro.weebly.com/uploads/1/3/2/7/132740725/2924606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460723/normal_5fd6ff9c51783.pdfIn PDF document text
    • https://munopufunorari.weebly.com/uploads/1/3/4/8/134881547/1852.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 5216 bytes
SHA-256: ada24966c2b033aa42f3195ab11999d11ed90a1285373cb0320f8ad0f1baa1fc
font_01_sfnt_off0000f185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 11124 bytes
SHA-256: 031ce8fae9a4dd29e9157467fcdf33540128eb463c7f7bf3445fc4bb362dc518

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