Malicious PDF — malware analysis report

Static analysis result for SHA-256 f893b5ff44d0fd5f…

MALICIOUS

PDF

79.4 KB Created: 2021-05-20 06:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 050252d05764c9e8a0d9e697ff417230 SHA-1: 9d052778a64146c69fa88421111097826928d361 SHA-256: f893b5ff44d0fd5f25eaea9a7c2dcf7ee5f55e74110bf910ec60006094668eb4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL leading to a suspicious domain. Heuristics indicate a link farm and a ML classifier flagged the PDF as malicious, consistent with phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and external links suggest an attempt to redirect the user to a malicious site, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=kur%2527an+harf+ve+harekeleri+okunu%25C5%259Fu
    • https://dibuponabax.weebly.com/uploads/1/3/4/3/134340508/vikerixivugulagov.pdf
    • https://xesuxikoju.weebly.com/uploads/1/3/4/0/134095833/ratediz.pdf
    • https://fapudunaga.weebly.com/uploads/1/3/0/7/130776769/fipara-wotomoz-kotujaz-werod.pdf
    • https://mabunamu.weebly.com/uploads/1/3/4/9/134902385/pobubodof.pdf
    • https://nazoturifebigik.weebly.com/uploads/1/3/1/6/131606271/7786172.pdf
    • https://devusabuzanuwuz.weebly.com/uploads/1/3/4/3/134352374/7984459.pdf
    • https://giwelexe.weebly.com/uploads/1/3/0/8/130814055/2ed65da05a41.pdf
    • https://sorajofuwomukiz.weebly.com/uploads/1/3/1/4/131407138/6342778.pdf
    • https://mebuduwo.weebly.com/uploads/1/3/1/4/131453299/pijokikupisuvu_zotedarorokovo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nokiva/taxamodiwetirigaf.pdf
    • https://s3.amazonaws.com/pojikovewijeja/tinasejepanerubutinetider.pdf
    • https://uploads.strikinglycdn.com/files/e0b08df2-af5d-477f-940e-61c04513e18e/pisexabo.pdf
    • https://s3.amazonaws.com/xuvamuba/88001681939.pdf
    • https://uploads.strikinglycdn.com/files/9d64b0c1-103a-4bfa-9abf-9607ff605644/binoresewawedo.pdf
    • https://s3.amazonaws.com/pidufozu/rangers_apprentice_reading_age.pdf
    • https://s3.amazonaws.com/kifutizijebuj/ingersoll_rand_ssr_up6-25-125.pdf
    • https://s3.amazonaws.com/gizonukorad/future_perfect_continuous_exercises_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/2c4f9c83-0e10-4e74-af52-a69302e034fc/logo_design_app_for_android_free_download.pdf
    • https://uploads.strikinglycdn.com/files/0e8c3002-33a7-4229-a392-8aa7e441029d/rigutimelufutawajuj.pdf
    • https://s3.amazonaws.com/fulosobezur/47036652575.pdf
    • https://s3.amazonaws.com/wumodukubaru/zifizuzomivofodeku.pdf
    • https://uploads.strikinglycdn.com/files/0f9c5ced-ec57-4373-b5c1-3dbcad162dd7/how_to_reset_service_airbag_light.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df58.bin
5e32985c1b9ad0f1a30b0faa8992977471b7a148bb9e7d2f5e8dbb59f8408706		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF58 5052 bytes
font_01_sfnt_off0000f091.bin
50769275abfe2a9cec7054dd178faea62582cec3da338e50b357d0ae8ad3d0eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 12552 bytes
font_02_sfnt_off000116e9.bin
08f2051cef4c1e681cfc2cb7697aa6e69c738d0b28fb523b56d22afc9c195da2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116E9 16588 bytes

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