Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34e4a912643d5dc…

MALICIOUS

PDF

77.1 KB Created: 2021-04-01 10:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 65b58045c5223ad5525b587d18b6b11b SHA-1: ae1ed8f320adf1bb123c2f8a7cca5749e234d4f0 SHA-256: f34e4a912643d5dc7d90e5a347519c67843f2bbcc7cc2e657a6cedfed54363ec
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL and the heuristic PDF_SEO_LINK_FARM suggest the document is designed to drive traffic to external sites, likely for malicious purposes such as credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/123?utm_term=balance+sheet+format+ib PDF link annotation
    • https://fabezetenonuke.weebly.com/uploads/1/3/4/8/134846610/kajet-muxiditi.pdfIn PDF document text
    • http://jefuvumerusew.getenjoyment.net/ap_psychology_myers.pdfIn PDF document text
    • https://tibiwoxot.weebly.com/uploads/1/3/4/8/134881218/rapabajiwoxevo.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/automatic_differentiation_techniques_and_applications.pdfIn PDF document text
    • https://suzazenesegi.weebly.com/uploads/1/3/0/7/130776168/sawebajefa-mogopexiralo-xikepuwovigena.pdfIn PDF document text
    • https://koloputumoti.weebly.com/uploads/1/3/4/8/134887370/ragadasonotuz.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/dantes_inferno_an_animated_epic_full_movie_free_download.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/gavuritakukiwimaluxazovu.pdfIn PDF document text
    • https://fumaletaseker.weebly.com/uploads/1/3/1/3/131381433/fb52b2cb8378.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/liwara/mcgraw_hill_my_math_grade_5_chapter_11_answer_key.pdfIn PDF document text
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_bb5f58f2a6b34c8a95ee7a2b117910cf.pdf?index=trueIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_e5fe5c090ab04f16a476c1cef62c46c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/26630843060.pdfIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_0328f1eeac0845c29d2e81bbe7b7f4be.pdf?index=trueIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_866bc5e6ca644418ad9bd00e3bffd898.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/breeze_linear_algebra_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/cuddledown_linen_sheets_review.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_471ed09371b7497690e38357899e4ce8.pdf?index=trueIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/bearing_exercises_maths.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/breakfast_at_tiffanys_plot_analysis.pdfIn PDF document text
    • https://6b2d4799-12fc-456d-8881-596234ac9a0a.filesusr.com/ugd/ae8ff6_cf5dcd0cb61b4713bf22f3ed1e24f30a.pdf?index=trueIn 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_off0000f1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D5 5308 bytes
SHA-256: ef76c748acdb191f85decbb526724b780bb2b1b013c4a718e151e4150397fcc8
font_01_sfnt_off000103b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B8 10560 bytes
SHA-256: 15100e4c67cac831b5a2e5d750f60a01685501116f374895f9fdc286d4693815