Malicious PDF — malware analysis report

Static analysis result for SHA-256 894659a25e41bae3…

MALICIOUS

PDF

81.7 KB Created: 2021-03-04 00:08:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 64c338295a93a2a381037122a85c3125 SHA-1: 9e0d455e8d7cb33d6bb1a3c72191a52f1e47a896 SHA-256: 894659a25e41bae338328b80958b9ed9937e882f7b518ab1cbef7979b93af9e0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to other PDF files, suggesting a link farm or SEO manipulation tactic. The primary URL, https://botokaw.ru/wix?keyword=unblocked+games+weebly+unfair+mario, is suspicious and likely leads to malicious content or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the PDF structure itself is used to host numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://botokaw.ru/wix?keyword=unblocked+games+weebly+unfair+mario PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446643/normal_6010895e46971.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/Erjjtjk/uber_black_driver_salary_nyc.pdfIn PDF document text
    • http://goledipe.22web.org/tamasha_movie_tamilrockers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459324/normal_5fe004d5b1089.pdfIn PDF document text
    • https://mifabawir.weebly.com/uploads/1/3/0/7/130776047/tajojuzapoz.pdfIn PDF document text
    • https://cdn.sqhk.co/mutexeze/V2nvdU9/93255606550.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ralununajopupe.epizy.com/2002_jeep_wrangler_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/50_shades_of_gray_book_excerpts.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/volavitogajipo.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/delrin_acetal_resin_molding_guide.pdfIn PDF document text
    • http://nivewuwasidurus.epizy.com/67329987996.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/char_broil_air_fryer_turkey_time_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/navigation_bar_animation_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/google_transparency_report_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/kelev.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F8 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off0000f6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 3212 bytes
SHA-256: 3136bd705179b7b524518c34a2bf3ad8905952ed488fed46c897c3c991964c86
font_02_sfnt_off0001023c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023C 5728 bytes
SHA-256: 728a0ed0a89800631a9d1fc47eea90dd903401e4bb04ae423442e87345761359
font_03_sfnt_off000115c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C8 10240 bytes
SHA-256: 8be9d721d0c30b7c0cd1c61b3df07ef604503842e440ff3389e03597a4bc467c

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