Malicious PDF — malware analysis report

Static analysis result for SHA-256 f853ced8613e4b8e…

MALICIOUS

PDF

120.0 KB Created: 2021-03-22 12:40:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9475ad18f13ed631a566451f9a151c20 SHA-1: 232c35504581b1715a8b5d2b081423e4212c6e8c SHA-256: f853ced8613e4b8e7b647fddd29c4f23530b982e9a19240848b5b68cf9284d72
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm or content redirection strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://pelibifir.ru/award?keyword=root+words+prefixes+suffixes+pdf PDF link annotation
    • http://kevekozulanilim.sportsontheweb.net/straw_man_outline_examples.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/42525865534.pdfIn PDF document text
    • http://yyyyyyhhhhh.space/50448058410flpup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457272/normal_60511e19a4490.pdfIn PDF document text
    • http://ritual-venki.online/centerpoint_sniper_elite_whisper_370_owners_manualnnsae.pdfIn PDF document text
    • http://ch-redirect.icu/compound_inequalities_worksheetvcqtd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447086/normal_6054230190dbd.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/dupula/how_do_you_make_a_simple_trifle.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/chili_cheese_fries_nutritional_information.pdfIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_7e3145bcf88a4b31b189a3f628f22399.pdf?index=trueIn PDF document text
    • http://zawozunilutufu.rf.gd/retipitagog.pdfIn PDF document text
    • https://849cba27-c1c2-4801-a47f-514a08c45c3c.filesusr.com/ugd/7f7a2c_5ffa9a8945be4c218df5a1ccd9f2ea42.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/adeste_fideles_accordi.pdfIn PDF document text
    • http://fufuzadawefor.onlinewebshop.net/ncert_exemplar_class_11_chemistry_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/incident_report_letter_sample_format.pdfIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_6ad62839b8bd4613a0e4f1978f539631.pdf?index=trueIn PDF document text
    • http://fadugenogow.epizy.com/lixajom.pdfIn PDF document text
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_fc350aaab1314a01a3dbc75875a66975.pdf?index=trueIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_bef7a756decf40fd92be406d4ed0e9a5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/75469484039.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_off00019d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D16 4960 bytes
SHA-256: cd6739a9be8dac2e693d7cba7d2992d28d0a56ada0c6fa269365b3986657ac18
font_01_sfnt_off0001ae24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE24 10452 bytes
SHA-256: 5bb5d77c67f829a4c82ece581e625420fabf11eb7404901946bc5159b05ca685

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