Malicious PDF — malware analysis report

Static analysis result for SHA-256 834101e9fba0a491…

MALICIOUS

PDF

78.1 KB Created: 2021-04-28 20:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b4fbe255b16686c8d89dbc43a42dc114 SHA-1: 8ce4592afe0f68c698ca8b0f8ec9880372251d4c SHA-256: 834101e9fba0a491898b9cc817aa8e0667833f01890c650f09b52d1b52c0e9f4
156 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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=is+measure+theory+useful+for+machine+learning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500201/normal_5fda5c4e6b1b0.pdfIn PDF document text
    • http://gasurorir.sportsontheweb.net/nenelagamaluwefelutojijod.pdfIn PDF document text
    • http://jemulobapamiwu.mywebcommunity.org/arabesque_1_piano.pdfIn PDF document text
    • http://newutatokulu.getenjoyment.net/37659413410.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451045/normal_604a7f434afc7.pdfIn PDF document text
    • http://kofupum.mygamesonline.org/texas_instruments_ti-30x_iis_scientific_calculator_10-digit_lcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487927/normal_606257e6f0a29.pdfIn PDF document text
    • http://mudikovarew.mygamesonline.org/ruvanate.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_6c6ebad5c3d94827a26c117e4456b445.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/family_therapy_theories_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/canopy_queen_platform_bed_with_storage.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/suvajatu.pdfIn PDF document text
    • https://a1bd7baf-2de3-4c81-8914-4b74a732ecf9.filesusr.com/ugd/c89f15_0e179c62daeb4ea7900ed039c8a7b2a5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/family_newsletter_template_google_docs.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_fd108aa72c124edc9ca5c30e2213d1a2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/raja_bhaiya_video_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/visexirejefegeta.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/virutovopuvopuzedatiju.pdfIn PDF document text
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_679f4c2ea2474e48b28a1029568fd274.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixuzo/53144959363.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/sears_atlas_lathe_for_sale.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 5336 bytes
SHA-256: e053afe369c0fd3be43c2af012d95f11e88792fa4ecce438165340180211845e
font_01_sfnt_off0001051c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051C 11028 bytes
SHA-256: fc526e35ad955826d773c01b2749646785d772b696599419520d71e4771da775

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