Malicious PDF — malware analysis report

Static analysis result for SHA-256 58899ba9f7a5c1c5…

MALICIOUS

PDF

68.2 KB Created: 2021-03-18 05:15:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0685508b50e6bb8e8c65ca0785c20986 SHA-1: 9e157f6a5371807a165ac23319947e3a0665f5fc SHA-256: 58899ba9f7a5c1c592d2fa285408d938ea2d9e05a06da35dbe8d48c3f80ddcf8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high probability of malicious intent. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no specific script was extracted, the presence of PDF_URI and PDF_SEO_LINK_FARM heuristics points towards the document's primary function being to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=ordinal+numbers+pdf+exercise PDF link annotation
    • https://cdn.sqhk.co/wularumijif/gghjjbO/84899972137.pdfIn PDF document text
    • http://forisawidokomor.sportsontheweb.net/poster_asmaul_husna_dan_artinya.pdfIn PDF document text
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/tiremiluxututi-pexeviruma-susevogurikunib-wezeda.pdfIn PDF document text
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/6cf5b31a.pdfIn PDF document text
    • https://jenamojid.weebly.com/uploads/1/3/1/0/131070605/nuleguvusadim.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/GjajjPw/44487683971.pdfIn PDF document text
    • http://jesofoma.getenjoyment.net/el_proceso_de_investigacin_cientfica.pdfIn PDF document text
    • https://sinevojixataxer.weebly.com/uploads/1/3/4/1/134131740/6014951.pdfIn PDF document text
    • https://jubaluwaruzazux.weebly.com/uploads/1/3/2/7/132740890/kitovutitizibi.pdfIn PDF document text
    • https://cdn.sqhk.co/nupumusu/ghCjhhb/gosol.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/0a644036-c5fc-4bee-b65f-166af04f5d93/80585083911.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/sutuguzog.pdfIn PDF document text
    • http://fojosotum.myartsonline.com/can_i_buy_diabetic_test_strips_over_the_counter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfcd9bc4-f5b0-4d44-a0b0-256690642676/words_their_way_spelling_inventory_worksheet.pdfIn PDF document text
    • http://kalasoziluxolim.myartsonline.com/58839767167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a15c9ba-71dd-4a85-afb7-7b7ce5ce8236/49171138340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e5b4374-2d07-4930-b666-5185f8c2cb32/41183014226.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_off0000cf0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0C 5536 bytes
SHA-256: 61d1fd82ab4b6a3b560992411332315d46c1d4e3bb9cf7421da2a455a660b69b
font_01_sfnt_off0000e1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BF 9984 bytes
SHA-256: a011cd1d6a47a7d63e4a478926a40ac8408ad2fe8a11f9cef08e73bb2a311c05

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