Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5021a2ed180d6f…

MALICIOUS

PDF

87.7 KB Created: 2021-03-17 10:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d51b4e95c93d109b6d17c2c1c44ff24b SHA-1: d4d4b8ad424b0ac8672f41f3118e53c770943f53 SHA-256: 6a5021a2ed180d6fa19f97db2e75ed420b1b25575d6c8deeb373aa51e42ddb5b
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://baarspo.ru/123?utm_term=lpg+bottling+plant+process+pdf PDF link annotation
    • http://yognat.space/vivah_movie_bestwapyuxay.pdfIn PDF document text
    • http://gafuvufafokujop.sportsontheweb.net/dorokid.pdfIn PDF document text
    • http://rabemedexisubis.mygamesonline.org/hernia_de_disco_cervical_exercicios.pdfIn PDF document text
    • http://photoforce.ru/craftsman_weedwacker_25cc_manualcas0t.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/mobisutujumagesijukefa.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/how_to_use_a_tig_welder_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/subej.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/danisuroxiwemobovi.pdfIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_661775cb2d2e4af7a6b055ec96240a79.pdf?index=trueIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_29807c8d98704b1b93194b2e6d37fb8e.pdf?index=trueIn PDF document text
    • http://lafagelupuf.myartsonline.com/what_is_meant_by_biological_half_life_in_chemistry.pdfIn PDF document text
    • https://cd8fad78-6a19-43c6-878c-830d169ee42d.filesusr.com/ugd/ff0d91_5b7905f6582e4951b2009b5e27d27e43.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_14f1990abb64479b84e4390cd455efa8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/carers_allowance_form_to_print.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/2054949782.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/1st_grade_math_curriculum.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/zajilusedepilezo.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/epileptiform_discharges_in_child.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F51 1748 bytes
SHA-256: 2449bd8f1ad27ad33169d2a4075f33e881c95b24e6f57e5183d0ca920026b0fe
font_01_sfnt_off000117ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EF 5404 bytes
SHA-256: b283b2db896745cb30aa7e4882b976d18009e9cc7ebd2ff03bb78b0d847411db
font_02_sfnt_off00012a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5E 11176 bytes
SHA-256: f86fe31c8186503481ac2ee9461bcd56ebf850d070c1bed0d1da0f4ab8b6400a

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