Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53efa316bf9b755…

MALICIOUS

PDF

81.2 KB Created: 2021-04-05 16:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: fea6abb80771c1299a12f1f3f8481938 SHA-1: 1795f3a40619ecb3d4fa69fde8c3c211066644b3 SHA-256: a53efa316bf9b75574c845486cdf09c9858ca7ae27efa9cf5963603929b2b186
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable hosting, suggesting it is part of an SEO link farm designed to drive traffic to potentially malicious sites. The document body is heavily obfuscated and unreadable, but the presence of numerous external links and the 'PDF_SEO_LINK_FARM' heuristic strongly suggest a malicious intent to redirect users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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=assignment+abroad+times+today+free+pdf PDF link annotation
    • https://cdn.sqhk.co/difakezil/Tskjfxf/home_assistant_docker_update_script.pdfIn PDF document text
    • https://xapidusexinixov.weebly.com/uploads/1/3/1/3/131382907/vuwunuvif.pdfIn PDF document text
    • http://dkblogin-de.best/classroom_management_articless3inj.pdfIn PDF document text
    • https://rugabefek.weebly.com/uploads/1/3/0/7/130775918/waradikisabowet.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/f0iiihO/91703432239.pdfIn PDF document text
    • https://nasabera.weebly.com/uploads/1/3/4/4/134447265/5916747.pdfIn PDF document text
    • https://valiwuvubeke.weebly.com/uploads/1/3/4/6/134694219/4365346.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/4Jzwrjb/39353357011.pdfIn PDF document text
    • https://sixutaxujarupi.weebly.com/uploads/1/3/4/8/134882582/2c8c60f2699d862.pdfIn PDF document text
    • http://wersita.fun/best_graphic_novels_with_female_leadsn9uou.pdfIn PDF document text
    • http://bachanalytics.com/fafozunuwanakamegarull6mkx.pdfIn PDF document text
    • https://cdn.sqhk.co/lesepivir/5Eibnf4/22093890013.pdfIn PDF document text
    • http://inertbhjbj.ru/dauntless_beginner_guide_20180p5re.pdfIn PDF document text
    • https://cdn.sqhk.co/kugugofawaz/jXsihCB/68651720852.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/6bce207e-fcf9-4ac1-8999-4756f35e8306/what_is_the_meaning_of_finding_a_blue_jay_feather.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ec0bded-b8a3-4384-847f-9cc5b269dd3b/kuzafebuzowukebal.pdfIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_d49c689256d9468f89aa06a41951a135.pdf?index=trueIn PDF document text
    • https://eeff404e-5492-4914-a1d7-e39d1f35e6b2.filesusr.com/ugd/e58d70_515b747138b941f287ace7aa8b748998.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79600a7a-6f84-4432-ae86-c3f59c990906/how_to_reset_pioneer_mixtrax_fh-x700bt.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/4404734576.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/cva_wolf_scope_mount_base.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/24258407571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/462c670b-4114-4fc8-be96-1a1ae83c4b21/fl_studio_12_vs_20_performance.pdfIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_5d2947f0b56f42938753826ad927e585.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1324f5b7-5e1c-4e4e-90d7-e4b4a26655ec/dozowamut.pdfIn PDF document text
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_116501f2c97446be8412a7bc5278def1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gozifep/itemized_invoice_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 5560 bytes
SHA-256: 1009e1e5ad8bb98c902362ed107178004c6a0d84f0efa5a4587cd05c92c3b1e0
font_01_sfnt_off00010561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10561 3580 bytes
SHA-256: 562bbcc04fce8a0bc3e44381c1005f46b05ed2ccd9fe3e05bb2e40eec27ab8c6
font_02_sfnt_off00011240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11240 10684 bytes
SHA-256: aae041067c30bbbdceef16c8237f1cd1b90e80ebea6ec4bc538bbadfabcab2e0

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