Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e24230e68b5a86…

MALICIOUS

PDF

78.1 KB Created: 2021-04-03 22:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d940175140b5dbb96ccffdbaa7ad9f5f SHA-1: 6a31acdde855b0f5ba4dc30069c5619dbfcf3e52 SHA-256: 72e24230e68b5a86fbea824940f64a8aef3dc680e8112133d25aed479aa23615
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one pointing to a link farm hosted on disposable infrastructure, suggesting a phishing or redirection attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lead users to malicious content.

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://druttle.ru/strik?utm_term=is+healthy+choice+simply+steamers+gluten+free PDF link annotation
    • https://cdn.sqhk.co/posojuvapono/ii1haXP/tasty_mixed_berry_cobbler.pdfIn PDF document text
    • https://cdn.sqhk.co/binuwaxe/k2jgh4K/zederilel.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/24813395414.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/g8UmXgi/91860417301.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/jjhb3YT/ice_cream_cake_delivery_san_francisco.pdfIn PDF document text
    • https://cdn.sqhk.co/tolononof/e9geRBn/sekoza.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/a6537d39-b292-43f5-acb4-21b9e12873d4/netgear_prosafe_jgs524e_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64e34366-cfbb-4e6c-80ff-779f6b0ef14d/what_is_critical_theory_brainly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d071b417-86da-4b00-a190-028c5f20de62/51793701110.pdfIn PDF document text
    • http://muzulozak.atwebpages.com/aws_certified_solutions_architect_associate_book.pdfIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_c097aba7c4d94e4b8f7645d56cb81134.pdf?index=trueIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_a62671a241c84003b4e78e95320dbec9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bf6d79e-1bc4-4705-a92c-6e34fa7631c9/vajodelowoxiletamawabe.pdfIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_894f2dbe823b47f4a219def5f12f29cb.pdf?index=trueIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_e08be903c2ce4e9a95629b1cece049bb.pdf?index=trueIn PDF document text
    • https://b3a8b944-ddec-4d17-9b53-5a1c05c66d8c.filesusr.com/ugd/314503_1b2f3fb66fa242879019c41f708c1007.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dbea3cb-bb08-471e-91a1-9585160e85e1/82495318522.pdfIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_480103dfa8474af5bf4c5ce35a4b2223.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd9b5c12-52cc-4f46-93da-9c4b2f8f5409/spri_resistance_tube_exercise_guide.pdfIn PDF document text
    • http://xomutojekes.myartsonline.com/fifty_shades_of_gray_songs_download_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d66fb761-223d-449e-94ee-94ff0241f418/why_is_my_fridge_leaking_water_underneath.pdfIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_5d98b97730c8445e8790b5a8a7d97679.pdf?index=trueIn 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_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 5468 bytes
SHA-256: 84fa49a22bfef0cf0c63299e8b8a3042e62e0db91a7df6d2359b7ad7b8a23413
font_01_sfnt_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 10968 bytes
SHA-256: 740f2858812c6367bfcabdc6d4b27f2f4ddc00aaca163054e6199b1a27c4c4f7