Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fa16087b83b92e…

MALICIOUS

PDF

85.7 KB Created: 2021-05-04 06:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6b4183cd00bd50b0bb2ffddb155dd1eb SHA-1: 2379cd4bc0d3433b1e86b502d427d2f47ae59feb SHA-256: f3fa16087b83b92ec6dfcac923cb33075f330a23f56c845b7b16bfc40a18b0ee
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm. The primary external URI points to 'pelibifir.ru', suggesting a phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/strik?utm_term=marquette+179+mig+welder+manual PDF link annotation
    • http://savadaqwe.space/nefixipagodna7g.pdfIn PDF document text
    • http://girepodemaz.getenjoyment.net/70449546433.pdfIn PDF document text
    • http://prizinsta.online/zatujukunumeponq6hpx.pdfIn PDF document text
    • http://vashobereg.com/kokotajumititafsdqm2.pdfIn PDF document text
    • http://mafejaruvoje.sportsontheweb.net/language_acquisition_and_language_learning.pdfIn PDF document text
    • http://naturelofo.mypressonline.com/terry_wahls_protocol_food_list.pdfIn PDF document text
    • http://icily.xyz/trane_xl1400_blower_motor7z20g.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/topipovikapari/sodium_stibogluconate_dosage_form.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/star_trek_movies_chris_pine_beyond.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/chuchel_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/15091477124.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/is_harry_potter_available_on_audible_plus.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/what_is_the_main_theme_of_cinderella.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/xopitegawakemawokaviv.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/english_alphabet_exercises_for_beginners.pdfIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_6fbf6cbc879d45ef87a4c98c8a62cfdd.pdf?index=trueIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_730eac8dc73449f68fb7ebe36cd0a00e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/swiffer_wetjet_heavy_duty_mop_pads.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/perfect_squares_1-_100.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/37361222142.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/do_i_need_a_license_to_start_a_cleaning_business_in_florida.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_3710d89c5cb44c5aab74c9f26fd578f0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/33043944907.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/28815176300.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_off00010fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE4 5476 bytes
SHA-256: 391fec8a5f77abbaf59a2d58a5bbb02f7dec88e00a0e6a4f835ae3cc701e9f5d
font_01_sfnt_off00012294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12294 11264 bytes
SHA-256: af30f7644225fe4130aee3b3cf6749eb767884cab0a13f35a44d498c744380b1

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