Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb36339c0781a620…

MALICIOUS

PDF

77.1 KB Created: 2021-05-11 00:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d9723a0b9a2a29446783171dec5c6447 SHA-1: d40f82c16b3da2acd18c7839055ba3e2650a33be SHA-256: fb36339c0781a620d42998302b34ac14baee3fe94ead7adc997522be2fad55ca
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 external URIs, with several pointing to disposable hosting and exhibiting link farm characteristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://soxebez.ru/strik?utm_term=skilsaw+5150+blade+size PDF link annotation
    • http://biotringel.shop/1914085267uzypb.pdfIn PDF document text
    • http://kekewawoxugar.sportsontheweb.net/59776841020.pdfIn PDF document text
    • http://jefuvumerusew.getenjoyment.net/lonetetefakewip.pdfIn PDF document text
    • https://cdn.sqhk.co/bufudoraxala/NgedjcC/nudawil.pdfIn PDF document text
    • http://tortomsk.ru/954634893216e4lp.pdfIn PDF document text
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/6be7b51b67.pdfIn PDF document text
    • https://nezogifoxo.weebly.com/uploads/1/3/1/6/131637357/2416764.pdfIn PDF document text
    • http://ruwufuwetoj.mygamesonline.org/graco_nautilus_65_3-in-1_harness_booster_car_seat_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/IgihiNr/monkey_king_movies_list.pdfIn PDF document text
    • http://kedepoba.sportsontheweb.net/autocratic_management_style.pdfIn PDF document text
    • http://merovew.xyz/genetic_mutations_in_humansmgp2y.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/ibBkjdh/vogolujumixadagu.pdfIn PDF document text
    • https://xirunokud.weebly.com/uploads/1/3/4/4/134467368/tolaruvozukid.pdfIn PDF document text
    • https://kumenesasewoton.weebly.com/uploads/1/3/4/7/134773405/a45c1d1c84c4d.pdfIn PDF document text
    • http://biomanua.website/11895005373dwdmb.pdfIn PDF document text
    • https://julupoberoraw.weebly.com/uploads/1/3/4/3/134353221/be8be7.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/lewuli/jojo_stand_tier_list_part_4.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/tominosegexoromopade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f62b48df-e59d-4c69-81cb-938df21a8b6c/34941604646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d19a62f-9ae1-4dcf-a466-bc1abba446d3/mefokikawebesaduwajez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4064f926-1360-4f50-9829-2d4f39c9f693/invent_your_own_computer_games_with_python_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86f26630-b2b8-467c-95fc-edf4abbc1f9b/59363925216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58651f87-2313-45f0-87ce-70ce38101ce5/6761779062.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/29431034436.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/71877944534.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_off0000eed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 5488 bytes
SHA-256: 2aee7ab673d527852ccad4a09aac1567f68b21bd208db37223666dbe619e6c04
font_01_sfnt_off000101b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B1 10572 bytes
SHA-256: d3d4471c717c41dfb779cfa2493c75d2730443d1b6a98b03195435e958003682

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