Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da8cfa4eb494b82…

MALICIOUS

PDF

73.7 KB Created: 2021-03-19 01:13:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: acec1c1c0989154af7c7e216cbd30394 SHA-1: 59cfd0d1848e1efc6c797e2c8c7f787cb265ea4a SHA-256: 3da8cfa4eb494b82f893a0a372516f3d1bb34164abf4b47c809ec7f23b012b21
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 0.9999

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://xezojetit.ru/strik?utm_term=48+laws+of+power+quotes+1-48 PDF link annotation
    • http://rimiripa.mypressonline.com/60957630129.pdfIn PDF document text
    • http://goldenframecollision.com/burnham_gas_boiler_manualrsn6o.pdfIn PDF document text
    • http://onsideball.info/dexerefebeq542v.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/909d2959-5805-4fb0-b0f5-50cca2276370/ethiopian_grade_7_mathematics_textbook_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57856c6b-0938-4913-a18e-d257aa0e974d/72972986664.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/62142296914.pdfIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_a0c4cb4e1835408fbe4db1efab3f32b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e0cf5f2-dfc7-421d-a54c-19cf9ae6881b/how_does_the_book_misery_end.pdfIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_e9945caf4a3f4346b74ebf00c96b9354.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/65046f43-2ab4-4389-9404-2c524dbe3b09/93895978240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b0f6253-a888-49a8-b895-db9f9ce313fa/67039209325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56f826bc-d4b7-4804-86af-d6889650c540/bissell_revolution_carpet_cleaner_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53cc2ff7-1d0e-4864-af26-cb82d188b34c/how_do_i_connect_my_audio_technica_lp60_to_speakers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1a4890c-ea1f-41b6-bd30-59048469632d/juvedexim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9419584f-7774-4d61-8503-c2d3403422af/49760851394.pdfIn PDF document text
    • https://3f054cde-0430-4828-89d0-5f77035cf230.filesusr.com/ugd/d93890_ffc2ca4505574b90a6699cc35d41547c.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_off0000e400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 5384 bytes
SHA-256: 6e993f070740132e4e68327a8992157e0962b543e582e55495125d8eb04e8acc
font_01_sfnt_off0000f68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68A 10408 bytes
SHA-256: 9eafad9027475e1dd84d254ec4bc57c12879baaf39b97c22f1d7c9afc1314c4c

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