Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4c7c77065c4ca2…

MALICIOUS

PDF

71.8 KB Created: 2021-05-03 18:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4cf31c86a9f0969e57f19bbff8f2b6a1 SHA-1: 5a5af5c7e1d9a35229264a988df5fb7d516572f2 SHA-256: ca4c7c77065c4ca21f3a6f1d3f8929fd4788b5c1bd34e8e1d472f732cb5422f7
186 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 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://fokemale.ru/strik?utm_term=golf+buddy+price PDF link annotation
    • http://whitetwo.space/lobo_de_wall_street_margot_robbiewvpdk.pdfIn PDF document text
    • https://bumarotijij.weebly.com/uploads/1/3/4/6/134688095/rikulubuzepek.pdfIn PDF document text
    • https://bibomezu.weebly.com/uploads/1/3/2/7/132710601/jugoleximu_najorefomux_jotajig_tazuxajaket.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447460/normal_601cb5acbcc39.pdfIn PDF document text
    • https://kiwaposuxixu.weebly.com/uploads/1/3/5/3/135329520/50480b4f4f824.pdfIn PDF document text
    • http://timecodes.net/android_adb_shell_root_permissionon4b8.pdfIn PDF document text
    • http://lnstagram-helping.live/el_proceso_de_la_investigacion_cientifica_mario_tamayo_y_tamayo_5ta_edicionzrkq6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465403/normal_6005271d4c088.pdfIn PDF document text
    • http://zumedemuruva.22web.org/luduteputikaved.pdfIn PDF document text
    • https://gegadibiliwo.weebly.com/uploads/1/3/1/8/131871883/3645818.pdfIn PDF document text
    • https://pujuxuzanebov.weebly.com/uploads/1/3/5/3/135351243/gafifobape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374364/normal_6024483442f87.pdfIn PDF document text
    • http://organicnu.info/rulakimipikupp6m2.pdfIn PDF document text
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/rewufo-digiwopuxufolos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_dbb01f47c76044b29b2a98aae03f4865.pdf?index=trueIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_d96d78e5820548f791d3c1edc9789fcc.pdf?index=trueIn PDF document text
    • http://xakixezusasop.epizy.com/rakipivot.pdfIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_d079aa8a453b4011ae16f47b842a96d0.pdf?index=trueIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_c5cb66211708491f9d831e45be0cd1fb.pdf?index=trueIn PDF document text
    • http://wivonuwexewixir.rf.gd/busqueda_de_informacion_en_internet.pdfIn PDF document text
    • http://dumumuvuxu.epizy.com/alternity_warships.pdfIn PDF document text
    • http://lanesoxulixag.rf.gd/chhota_bheem_ke_cartoon.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_off0000dd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD14 5036 bytes
SHA-256: cf3e2b0c249bb79063acc35cbfff6e021babfcbd2a3d51cbf3029934ae49afbe
font_01_sfnt_off0000ee53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 10512 bytes
SHA-256: 264b7c98762bb6be3a36f9d451ba33787372e8b0637d4564da54eef94b3f8085