Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7795d4f7b57c701…

MALICIOUS

PDF

98.5 KB Created: 2021-03-25 13:20:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2d385cabf6cefd9cb88e88d3a98cd766 SHA-1: f63aac6201f67e2658d74ebc78e76eba95bff1b8 SHA-256: a7795d4f7b57c70187a85bcce48ea8aad4cb285caf05ef5c19d455aa6a7eec8a
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://baarspo.ru/award?keyword=atresia+pulmonar+com+septo+integro+pdf', is associated with a phishing or malware distribution attempt. ClamAV detection and ML classification further support its malicious nature. No scripts were extracted, but the PDF structure and embedded links indicate a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5256

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 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
  • 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://baarspo.ru/award?keyword=atresia+pulmonar+com+septo+integro+pdf PDF link annotation
    • http://gudelew.mywebcommunity.org/is_there_an_app_for_directv_remote.pdfIn PDF document text
    • https://cdn.sqhk.co/dawupana/03iigiV/patujavisapedin.pdfIn PDF document text
    • https://cdn.sqhk.co/genizataxom/TiejfbA/rutegirup.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/noun_phrase_worksheet_with_answers.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/sijubome.pdfIn PDF document text
    • http://saniwigudovo.scienceontheweb.net/benami_property_act_1988.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/fifomi/homonyms_in_tagalog_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/430710b7-e0d2-4792-8683-04e5175c495a/hp_probook_4520s_datasheet.pdfIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_d278f2d509a84f6e80765a611ada7dc5.pdf?index=trueIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_841aca59c3034fd980d2ef86a7c521a9.pdf?index=trueIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_f44410cabd024613a17706a993bc92e2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/76664127622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/383b5833-d4c9-44da-869a-2bfaf32c85c6/cyberpunk_2077_review_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bc32fb9-a819-4586-bc8d-b876a40b5f4b/75707929688.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/pezola.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/35392272460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/639625b9-6345-4747-ae22-3aa6fc2f7f6b/milasodup.pdfIn PDF document text
    • http://sujawokasafu.onlinewebshop.net/11454117860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8996d24d-78ef-4448-b985-5697a40a637e/rufelen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f8ce6ad-2f07-4324-be0a-1b345a9e317a/5990280648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf6c337d-1be2-439e-9c8d-4c7ec5efb70a/aws_cloud_security_certification_path.pdfIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_d27e3ef0f10e4a28b4329b2db761487a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab1e0f0d-96dd-405a-898d-4d3be0f2f8d5/robotovefamedopogukolaniv.pdfIn 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_off00015991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15991 2900 bytes
SHA-256: 68d094faf81d2ea9f62e68ee4e789e40b6192f27e323b9e50c58fbaa8f881837
font_01_sfnt_off000163d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163D4 5464 bytes
SHA-256: 73bdfa8f459ec111d9bca48b424ade65e8217ef30b63f9f5162ce0fef2d27814

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