Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ac738c2ada7609…

MALICIOUS

PDF

78.4 KB Created: 2021-04-30 17:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6aa70857838105abf64294d7555f7a9a SHA-1: 22adf9d2b85bbc31e98a6b685cc2386710b1587c SHA-256: f6ac738c2ada7609fe6c381ece23c95724025d563255acb5e7fc19ac6a236f57
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a link farm and an SEO redirector suggests a phishing attempt, likely to distribute further malware or steal credentials. The embedded URL 'https://kuzutuzo.ru/strik?utm_term=chicco+keyfit+infant+car+seat+base+anthracite' is a primary indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://kuzutuzo.ru/strik?utm_term=chicco+keyfit+infant+car+seat+base+anthracite PDF link annotation
    • http://pofogivupuxide.iblogger.org/bonabagupobepotanipazuf.pdfIn PDF document text
    • http://mimowetoxizov.22web.org/jevavuvuribalikuroravol.pdfIn PDF document text
    • http://jakugurotugalow.22web.org/buff_dudes_bulking_plan_download.pdfIn PDF document text
    • http://gididowofugu.iblogger.org/strategy_consultant_resume.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7a6021ad-ea99-40b3-bafb-6570e045b460.filesusr.com/ugd/527ec5_fd3d8811eb5f4362bfb0ef4e5d9244df.pdf?index=trueIn PDF document text
    • http://fogigekitomug.rf.gd/how_to_use_single_stage_urethane_paint.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/badana.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/how_does_gallstones_form.pdfIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_32d27c3aca6f4bb9905684374612dc03.pdf?index=trueIn PDF document text
    • http://melukibojenubud.rf.gd/77486309969.pdfIn PDF document text
    • http://pikowejinaruwut.rf.gd/27449398966.pdfIn PDF document text
    • https://d85b1738-a471-4043-b59e-116b2bb794a3.filesusr.com/ugd/97927e_3a75702adfd94cd6bdb5e48dd7241424.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vasofirida/olx_app_from_google_play_store.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/88220852776.pdfIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_4ceff9907b254db3b0c5fbef8540da19.pdf?index=trueIn PDF document text
    • https://53f03ce6-db0b-4f41-9bfc-6956ba41e1f4.filesusr.com/ugd/727e0f_ae491cbf812e41529611647fc1b37743.pdf?index=trueIn PDF document text
    • https://6754c94d-8795-460a-880d-d127bb37d4d4.filesusr.com/ugd/2383dc_fe1c151b4c754ba5aca3244bf5055ab0.pdf?index=trueIn PDF document text
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_3f350f4971404d729dc5d2347ad559a3.pdf?index=trueIn PDF document text
    • http://pidumug.epizy.com/print_july_2020_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/bluestacks_android_version_7.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/aplikasi_desain_rumah_android_terbaik.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/dobuxedibemeluzuti.pdfIn PDF document text
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_2b11f2b7624e4008b7eee363249105c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/nordictrack_a2550_pro_assembly_instructions.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_off0000f359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 5148 bytes
SHA-256: 3183b97d1327ecf0ca5a5f19e8d604eb3714c6edb33bd707b73f965ff2171f44
font_01_sfnt_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 11444 bytes
SHA-256: 142ef6ee2d7ac7c84dddd95ae03526ae5d0b71d486a97c26a91198d923ad5331

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