Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f2d6841f03ac66…

MALICIOUS

PDF

72.1 KB Created: 2021-03-02 17:46:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5e783d888137b067bf0ff5fe8fc30dc2 SHA-1: b57289dddaa9c7a47c04ca0bc00de2f6748d0e5a SHA-256: 37f2d6841f03ac667b86f27dd2980592eb62ee61e13eaed040e30e0e1f325310
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. 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 it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://xajibur.ru/wb?keyword=dodge%20avenger%202013%20sxt PDF link annotation
    • http://homeolimp.com/wheat_belly_cookbook_review3xrnp.pdfIn PDF document text
    • http://javaxirivibewi.mygamesonline.org/41575546911.pdfIn PDF document text
    • http://autokenn.com/58027001337oij8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471690/normal_60186a2a90be6.pdfIn PDF document text
    • http://kudusakepupa.sportsontheweb.net/how_to_put_paper_in_kyocera_printer.pdfIn PDF document text
    • http://magicwoolshop.com/stop_caretaking_the_borderline_or_narcissist_reviewq8sr2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427519/normal_5feb7f2852141.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/64422116317.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/google_assistant_go_apk_for_android.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_off0000dbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAB 5576 bytes
SHA-256: 2716c1e908e09cda9a7a56e3661ed248b90a08216ddf5de6cd157bce4cdd58dd
font_01_sfnt_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 10976 bytes
SHA-256: 0d13c13c48727f0c22d3c63ddc408ee5109c4ca139ce3b518d7672a4e2fa8c79

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