Malicious PDF — malware analysis report

Static analysis result for SHA-256 b965b4d9574d8647…

MALICIOUS

PDF

87.3 KB Created: 2021-03-23 03:47:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1d3236fdf344171668cdc5876a465852 SHA-1: 9f672675a6c92903f6e3ba0c20affefc6b2042d0 SHA-256: b965b4d9574d8647eda76fce211fa8ec4e89fb9315f5d498ce77ee2546f39dee
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains malicious content or exploits. The heuristics indicate it functions as a link farm, containing numerous external URLs pointing to other PDF documents, some of which are hosted on disposable domains. This suggests a phishing or SEO manipulation scheme, potentially leading to further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/123?utm_term=kings+river+arkansas+fishing+report+2018 PDF link annotation
    • http://duzeliwuk.iblogger.org/chemistry_textbook_for_class_11_maharashtra_board.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/4hdtji1/switch_lite_bundle.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/eaiUjj7/portable_home_picosecond_laser_tattoo_removal_pen.pdfIn PDF document text
    • http://kiluzilaw.sportsontheweb.net/encyclopedic_dictionary_of_roman_law.pdfIn PDF document text
    • http://ruvagusowi.22web.org/sotekemibuj.pdfIn PDF document text
    • https://cdn.sqhk.co/xoraxuvonaf/oopT4jh/death_road_to_canada_marathon_mode_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/ckASgh5/51494502564.pdfIn PDF document text
    • http://kovemiwixipogaf.66ghz.com/karodawefevijepazaf.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/ja3vggt/rolling_stones_magazine_covers_archive.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/4qMYjjm/owl_spirit_animal_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/hdQQbsb/4228408021.pdfIn PDF document text
    • https://lomimasexoguxi.weebly.com/uploads/1/3/4/7/134736135/vonelerewufifepa.pdfIn PDF document text
    • https://zazibarem.weebly.com/uploads/1/3/0/7/130775746/nodukitinu.pdfIn PDF document text
    • https://cdn.sqhk.co/mugetawelumi/vha2cea/89851164687.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/24fb02b3-8dec-4582-98ae-db2a25af6a52/70964285076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee318b13-4835-40f6-bd41-5844cc8ab640/xutoxuvanorebiniwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c817018-2369-4e08-9dc1-8c578ae73990/2015_jeep_cherokee_service_manual.pdfIn PDF document text
    • http://pepezuvizomu.rf.gd/xegeneramujasifom.pdfIn PDF document text
    • http://lixugafepujijoj.onlinewebshop.net/zarugafimabapafagoxevofav.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
font_00_sfnt_off00011559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11559 5744 bytes
SHA-256: 33f740fbf98cc681c2990941fefbf906af675fdaa1fcf7829381cf6ece395c56
font_01_sfnt_off000128f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F9 10900 bytes
SHA-256: b963d732bb0c5eb7c87d46b043ad41cde06c75835e89c6cf6e1d7d5c9be5b96b

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