Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a7511c351e05c0…

MALICIOUS

PDF

155.6 KB Created: 2021-03-28 10:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a6c9570ea6c3d59d42914799187c340 SHA-1: 79a24ae98f869a06142b188d5efc59a6a9fb88f1 SHA-256: 03a7511c351e05c0caa7cb22c42fda70c7655b13ff7240e46de5f0cb558db970
182 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and a machine learning classifier, and contains embedded links pointing to known malicious redirector infrastructure. The PDF also functions as a link farm hosted on disposable domains, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9351

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://yafferge.ru/award?keyword=mind+body+dualism+pdf
    • http://cocobeautybar.ca/tesekiradofuxun5ano.pdf
    • https://cdn.sqhk.co/wesifarajaru/iV4lgeU/do_lynx_spider_bite.pdf
    • http://matrixbicycles.com/camtasia_studio_8_trke_yama_indir6qzk0.pdf
    • https://cdn.sqhk.co/mezutorixo/geia0Lj/86694566702.pdf
    • http://tk-time.site/48327806380qt0ve.pdf
    • http://limezage.scienceontheweb.net/pdf_to_word_converter_program_free.pdf
    • https://cdn.sqhk.co/mowezeto/ugpKghg/dj_bottle_telugu.pdf
    • http://jipolavex.medianewsonline.com/20187502729.pdf
    • https://cdn.sqhk.co/nerenina/1ib5l0R/33645322614.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_6325ec91847949e5b837fcb2680852f6.pdf?index=true
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_2bbe634991cf4272ae5449169baaad92.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a158c45a-b43d-40e3-86a6-e1f95610e4a2/zegufaridegidafekamirati.pdf
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_3e6002aacb574d09b4e5153e4721cfec.pdf?index=true
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_53f5be01770b49f08925c626bbf62a29.pdf?index=true
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_3d5af7dbd00f490d840ccfb136564a71.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b8d0d916-a3f2-4efb-b48b-9edc312f240e/87217110292.pdf
    • http://wutesejib.onlinewebshop.net/pathway_atresia_bilier.pdf
    • https://uploads.strikinglycdn.com/files/2856de65-e9a7-4a5d-806f-c9bf7a4a9889/potty_training_in_3_days_book.pdf
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_c7dead62dae3403fbbd95282d2cc6fd3.pdf?index=true
    • http://ziwivazud.onlinewebshop.net/63583504926.pdf
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_edc2662f0d1d41bf8fa28861f2f7b404.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5b12d70a-4bca-44a1-81b1-5fb4760c4313/48640097439.pdf
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_17dbaa4a47d143b388a1f4e79fe0e510.pdf?index=true
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_7036f2369f354c288874a1722d22adf5.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00025b7b.bin
02f6c3da95ce3a0cd080fe32691ad4623a53aa26125a2e956e33726a696b07c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25B7B 5336 bytes

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