Malicious PDF — malware analysis report

Static analysis result for SHA-256 e837a65750d55071…

MALICIOUS

PDF

85.2 KB Created: 2021-04-19 08:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2f6c3063a24b0f92e473d377bd2fe935 SHA-1: cb525b3ce46d0c33cac79ad011749bb7d57989c2 SHA-256: e837a65750d5507121fec662b151f64bce4c5c93211330c14dca458793369ea2
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/strik?utm_term=apc+smart+ups+1500+xlm+%25D0%25B8%25D0%25BD%25D1%2581%25D1%2582%25D1%2580%25D1%2583%25D0%25BA%25D1%2586%25D0%25B8%25D1%258F PDF link annotation
    • http://ig-copyrightnoticehelp.com/124882616423a67y.pdfIn PDF document text
    • https://galewijukinez.weebly.com/uploads/1/3/2/6/132695540/lilem.pdfIn PDF document text
    • https://rakevuxex.weebly.com/uploads/1/3/4/0/134040666/lizopo.pdfIn PDF document text
    • https://zelekunidos.weebly.com/uploads/1/3/2/6/132682808/89e3743f23cef44.pdfIn PDF document text
    • https://tibufidis.weebly.com/uploads/1/3/0/7/130740046/sakogowavigo_reduzupesovasa.pdfIn PDF document text
    • https://wuzikixow.weebly.com/uploads/1/3/0/7/130775075/xurisaputalef.pdfIn PDF document text
    • http://agent-ritual495.online/samsung_un40j6200af_remote_code66xt3.pdfIn PDF document text
    • http://fly-drive.online/projet_de_loi_de_finances_2020_maroc0eesh.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/8700333.pdfIn PDF document text
    • https://desebenenoda.weebly.com/uploads/1/3/5/3/135348916/48e62f.pdfIn PDF document text
    • http://vixilebi.iblogger.org/nigavudulugasaxifineb.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://tiktokfrance.fun/definition_of_formal_assessment_in_educationyhchx.pdfIn PDF document text
    • https://dogeneli.weebly.com/uploads/1/3/0/7/130776728/1114101.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://devisufuxuvit.epizy.com/babylon_dictionary_for_android_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d9bde40-ac82-4ff5-8acd-0beb6bbbe571/podez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d7b41a2-0272-45c5-8480-65db5ace96fd/is_cfa_the_hardest_exam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30607629-0074-43aa-9114-c1e5099bcc04/32261107905.pdfIn PDF document text
    • http://loxipov.rf.gd/60631656178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93a7b3ee-c139-4438-b01e-ed63de2acff0/felikowogesixojunen.pdfIn PDF document text
    • http://vojitexaruwulo.rf.gd/bodatox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6949768c-478e-4901-b0c8-ae0420db40ba/omron_hj-320_pedometer_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c7ed727-c600-46bb-a72a-2075be415805/sales_tax_calculator_san_antonio_tx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6658ada-70e6-4640-bca3-71961c18031f/ruckus_prices_in_philippines.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_off0000f8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 6224 bytes
SHA-256: c61d0c146139cb16c0b59378beb67bcb88b08bb65ecea10d6b51d7476a0db0c1
font_01_sfnt_off00010d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2C 18132 bytes
SHA-256: fc6059c84e52df8ac8b44c46c092b7aa4be9d5233be70123819e1e1804632bbb