Malicious PDF — malware analysis report

Static analysis result for SHA-256 570823d974e925b7…

MALICIOUS

PDF

97.4 KB Created: 2021-03-18 15:53:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b5b4f819ffe4499a1d70c0223ec9e7a SHA-1: a871812de8145e9816792e2cd0e9b014b9a2428b SHA-256: 570823d974e925b77a092d6336fc2680da7cd90eb063b78d461ebff3b2bca0a6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document exhibits characteristics of a link farm, containing a large number of external URLs, many hosted on disposable domains. This is strongly indicative of a phishing or malware distribution attempt, as suggested by the ClamAV detection and ML classifier. The primary purpose appears to be directing users to external resources, likely malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://vilenefex.ru/123?utm_term=best+sound+software+for+pc
    • http://wiwovurezibaso.getenjoyment.net/nikon_speedlight_sb-600_will_not_turn_on.pdf
    • https://wumaviki.weebly.com/uploads/1/3/0/8/130874148/xatetesezunuforeviro.pdf
    • http://tigefezatolipeb.iblogger.org/fundamentos_de_marketing_kotler_11_edicion_gratis.pdf
    • https://litufefanim.weebly.com/uploads/1/3/4/9/134901191/2567e13d109472f.pdf
    • http://gosunenibunale.getenjoyment.net/pinuzoletipewe.pdf
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/befine.pdf
    • http://ginupedarokuxu.getenjoyment.net/59613543449.pdf
    • http://tujidal.mypressonline.com/70978424528.pdf
    • https://kowedeta.weebly.com/uploads/1/3/0/7/130775164/6358c9ee.pdf
    • http://bunowefutop.22web.org/perfect_english_grammar_past_continuous_exercise.pdf
    • http://ridaxaki.mywebcommunity.org/p90x_workout_workouts.pdf
    • https://bowotile.weebly.com/uploads/1/3/4/7/134759747/vinuzogox-pebefet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_e80b1e2cec364e748ee7a23fc7f34278.pdf?index=true
    • https://s3.amazonaws.com/wexoteluwag/bunokidonapamofotaw.pdf
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_8e610089b12e43acb5f6423ddf946dfe.pdf?index=true
    • https://s3.amazonaws.com/jedaxopopuko/fadaxukunar.pdf
    • http://lisuronam.rf.gd/zejazagotibiwesag.pdf
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_04438846824148438b67187865df7cdc.pdf?index=true
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_e9b671812f6e4354893d231e0e2e0a34.pdf?index=true
    • https://s3.amazonaws.com/dupula/60197803966.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012881.bin
d901d38fe51b4e71e01e8d60a6fc97fca5b1a458ed965133ca87ad6661b023fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12881 5260 bytes
font_01_sfnt_off00013a8c.bin
035574e996afbfca1fd8759296887c1609eabf532cac3e4654a25066e318c3ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8C 11416 bytes
font_02_sfnt_off0001615d.bin
99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1615D 16060 bytes

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