Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c1d6f597cd2e22…

MALICIOUS

PDF

81.5 KB Created: 2021-03-13 17:14:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7d0eb258e4efb8965b8122f7fef2a4d4 SHA-1: d66231e2c27dd5016a06ae001411f3a3c6d7ee12 SHA-256: 74c1d6f597cd2e223f6ca51c76b34cf58157758fe83862edcb43bd2254b27820
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, identified as a link farm, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its specific lure, but the presence of numerous external links is a strong indicator of phishing or redirection attempts.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=english+vocabulary+games+online+intermediate In PDF document text
    • https://bakinoxeveraj.weebly.com/uploads/1/3/0/9/130968963/detogeburikeniref.pdfIn PDF document text
    • https://nukusiluvo.weebly.com/uploads/1/3/4/6/134612364/nafamugubojifukil.pdfIn PDF document text
    • https://sajulivos.weebly.com/uploads/1/3/1/1/131164476/3045360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472775/normal_600b64dfe9638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457008/normal_60167e97cc2fb.pdfIn PDF document text
    • https://puxipevabama.weebly.com/uploads/1/3/4/3/134308905/reluzanek_xegolu_vefuxumubefiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418584/normal_600275a991fdc.pdfIn PDF document text
    • https://komamezumef.weebly.com/uploads/1/3/1/3/131398541/8cf6262.pdfIn PDF document text
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/fowujem.pdfIn PDF document text
    • https://nasoxatexiwek.weebly.com/uploads/1/3/0/7/130739087/e5817289.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/tanikanaw/hallelujah_shrek_string_quartet_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/rilepukekamurafo.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/dudululolefakagovomonodib.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/rhetorical_analysis_sinners_in_the_hands_of_an_angry_god_lesson_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/newspaper_templates_powerpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/ninasunebikalo.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/the_island_of_dr_moreau_chapter_4_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/rafinejuken.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/nefusanulebudovun.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1F 5612 bytes
SHA-256: 7675976b7ba10059b6352437bbef17879748323e4dc3696c68b9bc0ceca1730d
font_01_sfnt_off0000fd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD17 10964 bytes
SHA-256: 94bffb9100af8985206ae86d322b82bdfb6b9b41cb7bff0dd5b89dd6e4636599
font_02_sfnt_off000122c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C1 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf