Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74c8aa710641ebf…

MALICIOUS

PDF

84.7 KB Created: 2021-03-18 16:36:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b28d351126769cc2b09fc2cdd25f9d24 SHA-1: 9592d2ea9efc0126d4041953e71ee46c21693045 SHA-256: c74c8aa710641ebfbf4b109c82087bee0d6414a373f1c8cbb79dc89548ddb2aa
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://dafemum.ru/wix?keyword=nectar+in+a+sieve+online+pdf PDF link annotation
    • https://buxexemap.weebly.com/uploads/1/3/4/8/134890763/6954492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502336/normal_5fdb8854beef3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387241/normal_5fee8779cf09f.pdfIn PDF document text
    • https://mekaxojukana.weebly.com/uploads/1/3/1/3/131379168/gikobureviwes-jarupin-zigogeka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385887/normal_60466af302c00.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_4c7fa7e303274578ac93e5b346525693.pdf?index=trueIn PDF document text
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_b18da99afce64561bfa383015db2d532.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/043aceec-5acc-42eb-b57a-f90ce472ace0/95795861290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35744413-8d06-4931-bf74-4bf4b238b68c/how_to_draw_dc_comics_superheroes.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/xeputijapelibaribasorep.pdfIn PDF document text
    • https://e39bfc17-a898-4016-ac91-fc9303c112df.filesusr.com/ugd/b5068a_e2ac0e596f824633a34777a11cab07b4.pdf?index=trueIn PDF document text
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_546e7788da6c4b088e3b79d8fc4e36de.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lupebesu/10418589261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deabdc13-575c-45dd-98af-c661f924e39d/attack_on_titan_season_3_episode_1_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33209229-43d9-4e29-9fa5-87d28951de2a/quadratic_equation_vertex_form_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3edbe029-04e1-40dd-a51b-83276b3e9cde/84288899845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dac15666-5179-4a4b-854b-4460cdf57167/womowazisexogejet.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/8742622604.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_off00010e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 5176 bytes
SHA-256: d2c082329ff630a8426909f073b33f77645ba935b98eeb29d602eecf940364af
font_01_sfnt_off00012027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12027 10592 bytes
SHA-256: a6af95cd628bd84c1efd392cbbd135ae5f2f44e501e0015176aef9fbcbee12be

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