Malicious PDF — malware analysis report

Static analysis result for SHA-256 3579d7c9922d602c…

MALICIOUS

PDF

75.1 KB Created: 2021-04-30 22:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 99314fe67e5d724130a0553408c03584 SHA-1: bae13c6d57361b4d986bbf02719bb066ec0dc2e3 SHA-256: 3579d7c9922d602ca486d6580004a56abda7baa6b3c6a2a70ec2b1c30e05df74
186 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links, many of which point to disposable hosting services and are likely used to redirect users to phishing or malware sites. The document body, though heavily obfuscated, suggests a lure related to a product manual, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nipisod.ru/strik?utm_term=hamilton+beach+air+fryer+toaster+oven+manual PDF link annotation
    • https://mebogizudoredo.weebly.com/uploads/1/3/4/4/134472702/lomun.pdfIn PDF document text
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/2575354.pdfIn PDF document text
    • https://pujowelitolav.weebly.com/uploads/1/3/1/4/131438356/9511582.pdfIn PDF document text
    • http://bridgecommerce.com/prontuario_cemento_armato_santarellanpivt.pdfIn PDF document text
    • https://natorepoxikafop.weebly.com/uploads/1/3/4/3/134314237/6811129.pdfIn PDF document text
    • https://rimimasosonajis.weebly.com/uploads/1/3/2/6/132681992/8615980.pdfIn PDF document text
    • http://housefashion.ru/tujijuxifajuzu1yovh.pdfIn PDF document text
    • https://fadoxidibeja.weebly.com/uploads/1/3/2/6/132695582/3586080.pdfIn PDF document text
    • https://zezebeburopixem.weebly.com/uploads/1/3/5/3/135326834/xenukara-setifoxebafab-lawukokek.pdfIn PDF document text
    • https://wadumajaniko.weebly.com/uploads/1/3/1/3/131383958/rirejakazunim-saruroxuzet-kolesepepizes.pdfIn PDF document text
    • http://form-lnstagramcopyrightservice.com/how_to_run_a_book_club_meeting_on_zoomp5uf9.pdfIn PDF document text
    • https://vigijamavo.weebly.com/uploads/1/3/0/9/130968937/gexusodi_rigewad_wovesar.pdfIn PDF document text
    • http://wuroguredogir.getenjoyment.net/the_beatles_guitar_sheet_music.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/falevi/2495117027.pdfIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_9fe7014921a9436bb78011bd58df7450.pdf?index=trueIn PDF document text
    • http://bebovufuvuji.myartsonline.com/wodesus.pdfIn PDF document text
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_ac75648a67894c3386c781933c904cdd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/junuxamedewamekiwoxobewu.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_off0000e548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE548 5384 bytes
SHA-256: 283f87cb5ed92f375623d7b2d18a4bad07e64f2afc906765e911ada70154cd31
font_01_sfnt_off0000f77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 11388 bytes
SHA-256: 638f00e399d49049b9e6b6cf2fec2a7c566f9afc07dfb9906fc8372c1194b8cf

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