Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d75b165ba3906c…

MALICIOUS

PDF

78.8 KB Created: 2021-06-04 04:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b92706b1c5cddc728ea4ef3f6d3e28ea SHA-1: eb45f38d4d7d245d4734158363420d1fc92596c4 SHA-256: f9d75b165ba3906cfa55371db68cb32a2dad0f9b7086ca8bdf8d505fd2242ddb
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 0.9998

Heuristics 6

  • 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.
  • 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=angular+8+template+driven+forms+validation PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4408702/normal_60b57bd23a076.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/5807196.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449788/normal_605d5d09c67e5.pdfIn PDF document text
    • https://nuzukozifazo.weebly.com/uploads/1/3/2/6/132682871/ranukap.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4403283/normal_60b38bd048a21.pdfIn PDF document text
    • https://puzifisabu.weebly.com/uploads/1/3/1/3/131378936/vedezupave.pdfIn PDF document text
    • https://mewupigokudupez.weebly.com/uploads/1/3/0/7/130738506/00b7903a.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/b6ed88b0-528c-44c9-aed9-b0173273797e/film_investment_agreement_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67e010c2-6b42-4fcd-86dd-732693335f0d/blackjack_strategy_chart_with_surrender.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6143a99a-2cec-4361-a7da-d903e69080e7/vunaduniduxepededefude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7fc0713-79aa-4654-b0ab-da45ce8efe93/15926693481.pdfIn PDF document text
    • http://gupiguna.pbworks.com/f/gowujanakewezanusikaxoxul.pdfIn PDF document text
    • http://zalonuzojeru.pbworks.com/w/file/fetch/144478494/fanidoxixowidi.pdfIn PDF document text
    • http://lopofemusun.pbworks.com/w/file/fetch/144527952/mcgraw_hill_my_math_grade_3_volume_1_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7374e13d-dfff-4c62-b9ef-1d8a624b9319/how_to_change_a_unisaw_motor.pdfIn PDF document text
    • http://ropotupi.pbworks.com/f/the_secret_life_of_walter_mitty_movie_download_480p_dual_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e22c573a-80d0-4bda-8f90-2c40a3086def/tupasigamupiwujuke.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/f/xewokitajadob.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f3c8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF3C8 5604 bytes
SHA-256: 60ae7311fc8018f30907497901d1b54224f41d55c78d8c274d6f8e270320989f
font_01_sfnt_off000106cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CC 11496 bytes
SHA-256: 1ad2c102c4ab582c41b49f5eae9b01e720492407a9d74dfea4b4af104ffc7bbc

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