Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5497f0be311d4a…

MALICIOUS

PDF

77.4 KB Created: 2021-03-06 15:28:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c3b19f84deff73c05695f625a4fc10b4 SHA-1: efe7636aeea68f9616fe889e5499351aad937f4f SHA-256: 8f5497f0be311d4abff9cdc99df5c763e27321de2a71ccfd5b4607ac18f29481
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, indicating a link farm or SEO manipulation tactic, with the primary malicious URLs being https://crophysi.ru/123?utm_term=is+nightmare+fredbear+nightmare and http://wekeb.space/300825696977zgx4.pdf. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://crophysi.ru/123?utm_term=is+nightmare+fredbear+nightmare PDF link annotation
    • http://wekeb.space/300825696977zgx4.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/8879939.pdfIn PDF document text
    • http://zabovawupe.mypressonline.com/pesavosi.pdfIn PDF document text
    • https://pubabugolutaj.weebly.com/uploads/1/3/2/6/132680974/f4c90280d70354.pdfIn PDF document text
    • http://vogudikomi.getenjoyment.net/why_wont_my_kenmore_dishwasher_start.pdfIn PDF document text
    • http://opencabinets.xyz/fedloan_forgiveness_disabilitylj2aj.pdfIn PDF document text
    • http://mebel-albero.ru/jidope2htyn.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/d20_call_of_cthulhu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3e45a4ae-97ec-44de-b7dc-1d68019e74e7/what_do_mental_maps_show.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/13752110354.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/zuratudif.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/nomosasodij.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/block_specific_websites_chrome_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/xosegifusubazujegumo.pdfIn PDF document text
    • http://revudipepofaten.myartsonline.com/husqvarna_435_e-series_chain.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/17907547509.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/nissan_almera_tino_owners_manual_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/xepadikisupejabox.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/esc_guidelines_2019_svt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de9ebe67-f339-4307-8ccf-ec7b170e6358/best_web_design_books_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/34430896505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acc60b56-86bb-4ce1-9a70-29bd5304dba7/50096049160.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_off0000e536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE536 5044 bytes
SHA-256: 46016daffd03d1e008178c33412097ec7f7a047cda7472fd16d4dbcc8b091908
font_01_sfnt_off0000f614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 10828 bytes
SHA-256: 1669d67b5affbcd3e5a1f4108aea20fc8cda60d13c1610ca59e7d855ca22268d
font_02_sfnt_off00011a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A02 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

Open this report in the interactive analyzer, or submit your own file for analysis.