Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8941751f16b5d5a…

MALICIOUS

PDF

74.2 KB Created: 2021-03-20 07:53:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dac6e4565a14d78c17bef9014fc37f38 SHA-1: 93586b4a6354e3d3a0b720f354240f71b8b7a89a SHA-256: d8941751f16b5d5a5c51f810518b61aff330ebce7e37435b2e8bdbc6aead1412
186 Risk Score

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 0.9991

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://midufefew.ru/strik?utm_term=write+central+idea+of+the+poem+fire+and+ice PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4461249/normal_5ffc95e2e00e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421205/normal_5fcf8c67e9ab1.pdfIn PDF document text
    • http://rixujewo.getenjoyment.net/habanera_lyrics.pdfIn PDF document text
    • http://ligexekena.mywebcommunity.org/motores_de_corriente_directa_partes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373782/normal_5ff97ed56d9f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404524/normal_6045e5a41c47b.pdfIn PDF document text
    • http://lefibipefazefep.mypressonline.com/26805609338.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/nigeduv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9ff0a20-e005-4431-bd13-8f858430b79a/wamop.pdfIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_1849da6a228e4e67896ffdaa8c834b1f.pdf?index=trueIn PDF document text
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_64259eaa5efa4d95aee19d1213f25089.pdf?index=trueIn PDF document text
    • http://josesomesube.myartsonline.com/how_to_reorder_pages_in_adobe_reader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00ca0bab-8c22-4539-b666-b719b9fa3aaa/fiwijawazejifubupusobap.pdfIn PDF document text
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_906098e737b443ccb9f9823c0841734b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c532422e-20ec-41eb-a813-cc5898164f18/miniature_dachshund_puppies_for_sale_southern_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cd84be8-0cb1-4b6f-bcdb-e25ccb501aaa/79671572176.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/sirunula.pdfIn PDF document text
    • https://369206df-e466-4f8f-9771-850d1edb33c5.filesusr.com/ugd/8fd5dc_06a8ab3b32544434b5dbb61d8752423d.pdf?index=trueIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_523f609c1ede4305bbb6d00ebc3f7f0d.pdf?index=trueIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_12d16c0b6c094fff969179b549fabb49.pdf?index=trueIn PDF document text
    • http://pefimubis.myartsonline.com/xatetosifetilamixijafi.pdfIn PDF document text
    • https://1d78cdce-0032-4a75-b9f1-030f6b068c24.filesusr.com/ugd/32f660_7f0feaf9ba3c4a0e96abf0d868672fb2.pdf?index=trueIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/grid_dnd_5e_google_drive.pdfIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_53a2990a94664d0b80d596808fa598d0.pdf?index=trueIn 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_off0000e1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EA 5228 bytes
SHA-256: 8e458bc0a55c6d890ddd31ab9c5ca94893ff277fb613b96fcb1b2c28bb4a6bb0
font_01_sfnt_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 10996 bytes
SHA-256: 6bf742f23d11d3144d4af145fc190b2b4153e9ad7fc812fd73ff2d0cc24d06e4