Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a73bc50ce4ae4b…

MALICIOUS

PDF

70.4 KB Created: 2021-06-09 04:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 368ab5cb2d47721e105d7741326e7c01 SHA-1: 59055b06fd3f599e5a48c7851f6dc646385cfa04 SHA-256: 38a73bc50ce4ae4bb014712c13c627ef23baf6453ebfdc530d090947adbaff22
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites under the guise of providing educational notes. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://drafthe.ru/pbw?utm_term=class+11+biology+ncert+chapter+1+notes+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465125/normal_6064864605587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_5fd324599a4f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370280/normal_6069100423acb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381105/normal_6046c47e3cb52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_60287c789f0d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449973/normal_605c1556a579e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zubipuwaf.pbworks.com/f/pearson_edexcel_a_level_biology_textbook.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/w/file/fetch/144515442/gilasurozijagawedotame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc5ad04a-9a91-4708-a076-46764ebb13e7/71184821988.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/xojosibaluxirabatutesu.pdfIn PDF document text
    • http://nukosazizari.pbworks.com/f/introduction_to_chemical_engineering_thermodynamics_smith_van_ness_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b1b673-96e3-4e5d-b186-47e38ff0d97c/resound_phone_clip_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/298045e7-3542-4e64-8423-09a8707fe173/zebogupavavodiwosakoni.pdfIn PDF document text
    • http://rupebaxo.pbworks.com/w/file/fetch/144904008/talking_tom_1_unlimited_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3006547b-7b49-4abf-bd91-e916521c6573/crisis_communication_plan_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e503a8e-570c-451a-bd0c-cc0b58babf0b/how_many_carbs_in_a_taco_bell_taco_without_the_shell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d6eb6ec-2daa-4640-b748-e69c11399b95/44955703633.pdfIn PDF document text
    • http://dobifapig.pbworks.com/w/file/fetch/144657972/wifara.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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD551 5616 bytes
SHA-256: b135cbc6e027e4115bb1687aadfd05d994a92ecb722cc26c882706dcd06169d1
font_01_sfnt_off0000e868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 10460 bytes
SHA-256: 106998191a5f1cd24aa32c02beaec0b943a7658ceab84f0ceef9ebb7e0bfb7d3

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