Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a13c40bb09f6d0f…

MALICIOUS

PDF

97.3 KB Created: 2021-04-01 21:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e63722d1a1121f05f5ceadf399e061d3 SHA-1: 51282cdce11bd8dae1cc5fc1a1523b7f40097cb8 SHA-256: 0a13c40bb09f6d0fe413723a62d636b3ea3fef8823f13500d64ddb1c5020834e
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 0.9997

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://golowaki.ru/award?keyword=nysora+infraclavicular+block+pdf PDF link annotation
    • http://fajujefa.getenjoyment.net/chartered_financial_analyst_cfa_eligibility.pdfIn PDF document text
    • https://taxefijiduru.weebly.com/uploads/1/3/5/3/135311915/a616fb21711e.pdfIn PDF document text
    • http://xepewifub.mygamesonline.org/test_statistical_table.pdfIn PDF document text
    • https://vatopefo.weebly.com/uploads/1/3/1/3/131398509/gegiwimatis.pdfIn PDF document text
    • http://gafabotipunofu.mywebcommunity.org/73579575399.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_096a31401cce472ba2ed5ede7824652c.pdf?index=trueIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_4c4f7e60a2fc4a308daf033527f1fe9e.pdf?index=trueIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_83bb17dbd92642c58be35b3bab0521f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e2f363a-2471-48c4-9721-32dd6da72291/hearts_of_iron_3_download_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/611bf6b3-7f57-45b7-9e77-dd8380434870/gerund_or_infinitive_exercises_elementary.pdfIn PDF document text
    • https://cabae152-0d18-4cc7-9545-8711a89e332e.filesusr.com/ugd/607e04_bc0b4dfd96464f5585ef0aa9c1a0740c.pdf?index=trueIn PDF document text
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_946c499c7f2140c8a97e84cb6f30fac5.pdf?index=trueIn PDF document text
    • https://b1f0a730-f0e4-4bcf-918d-a915077b90d0.filesusr.com/ugd/a7c69d_e3885ef5bb2142dca9064447653d48b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e6ded61-0faa-4e85-867e-1877ecb7efcd/confessions_of_a_mask_audiobook.pdfIn PDF document text
    • http://solarujarinobo.myartsonline.com/good_times_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98823210-ef0e-4675-b4b5-18a10f597043/watch_the_hunger_games_mockingjay_part_2_full_movie_free_123movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eec56699-3c2b-41ab-9d3f-097ae3cc5f69/what_is_meaning_of_compare_apples_and_oranges.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_off00013fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB5 5484 bytes
SHA-256: 4d7e3becc13bcb38cf037732c924877810e21829bdb8b286a3f07151729260c0
font_01_sfnt_off00015280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15280 11176 bytes
SHA-256: 2b69ff3504e0117ebb0af6d8582ebced83602283c31fa086d2194927225cd766

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