Malicious PDF — malware analysis report

Static analysis result for SHA-256 798a435f351aa781…

MALICIOUS

PDF

76.4 KB Created: 2021-05-11 17:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 539ee2477ba4d89a1ac82edf240afc4d SHA-1: e440e63fbfa5e7270c8e394001103b19d9d4ca39 SHA-256: 798a435f351aa7818f905dd8521e1d578f91257b72770c51ffc297451834f446
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan variant by ClamAV. The document contains a large number of external links, suggesting it is part of a link farm designed to direct users to potentially malicious websites. The primary malicious URL identified is https://pelibifir.ru/strik.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=air+force+enlisted+rank+symbols
    • https://denosuzasagi.weebly.com/uploads/1/3/2/7/132712615/455336.pdf
    • https://sakenudawajaka.weebly.com/uploads/1/3/4/5/134595508/wafuvupa.pdf
    • https://resodarapasak.weebly.com/uploads/1/3/4/6/134659305/3976505.pdf
    • http://indir-kazan.com/how_do_i_reset_my_boat_bluetooth_headset9x9ik.pdf
    • http://rodupokikoxozed.22web.org/the_spy_paulo_coelho_summary.pdf
    • http://mnatural.space/charlie_malayalam_movie_background_musica8nwk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/38844603-651e-4c60-a6d7-eac9d71af191/free_easy_crochet_table_runner_patterns_for_beginners.pdf
    • https://s3.amazonaws.com/gelawiweza/korisosajurug.pdf
    • https://uploads.strikinglycdn.com/files/f583e6cf-b824-4afe-8f3f-d59a5f6d8d5d/dream_interpretation_dog_feces.pdf
    • https://uploads.strikinglycdn.com/files/621fd3d2-48ad-420b-a5ef-afb939357e54/how_to_write_script_coverage.pdf
    • https://uploads.strikinglycdn.com/files/fcf7d237-4365-462d-be2e-d46258b94c37/81769104427.pdf
    • https://s3.amazonaws.com/jovekus/what_is_stealth_attraction_secret.pdf
    • https://s3.amazonaws.com/xupizewuxere/how_to_troubleshoot_a_trane_heat_pump.pdf
    • https://s3.amazonaws.com/bevekizadoxuj/fobugoge.pdf
    • https://s3.amazonaws.com/penefelomiju/46796257143.pdf
    • https://s3.amazonaws.com/faluzotixupi/alveolar_hypoventilation.pdf
    • https://uploads.strikinglycdn.com/files/4793f359-c315-4f98-bd21-b25b8bbf3fbb/lg_ductless_heat_pump_troubleshooting.pdf
    • http://bowupezik.epizy.com/70221710760.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec1d.bin
3876075f3cc7fc81c8c679fadccd5bc7d383ba1557a48039221a84236c7fb868		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 5460 bytes
font_01_sfnt_off0000fea9.bin
ccdb0c9b591cce76f3be1f96cc08abc35639fbcf19fedd2352e159facb9b7387		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 11040 bytes

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