Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6b225122c9ca2f…

MALICIOUS

PDF

80.1 KB Created: 2021-03-22 03:59:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a6a1c6c55426979a5801c0a8e1e86c0 SHA-1: 7dacf5efc7a845326160269d8a84bb1e0032170b SHA-256: 4a6b225122c9ca2f3dc70792d19436cd0aa9bcfa23afc789c7c5e67e8c989250
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 SEO-optimized, suggesting a link farm designed to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs point to suspicious domains, including one that appears to be a lure for a specific book title.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=network+security+fundamentals+5th+edition+pdf
    • https://cdn-cms.f-static.net/uploads/4380530/normal_6054226e7e240.pdf
    • https://cdn-cms.f-static.net/uploads/4468270/normal_602bf573bf036.pdf
    • https://cdn-cms.f-static.net/uploads/4374715/normal_6054bcda0cbd7.pdf
    • https://cdn-cms.f-static.net/uploads/4403282/normal_604e512664b60.pdf
    • https://cdn.sqhk.co/matijamaj/ho12Yaa/buvatareraxaf.pdf
    • http://xemakaze.mywebcommunity.org/battle_royale_book_download_free.pdf
    • https://cdn-cms.f-static.net/uploads/4375207/normal_60311cd78b77f.pdf
    • https://cdn.sqhk.co/vutabopi/c0GMVij/talking_birds_for_sale_toys.pdf
    • https://cdn.sqhk.co/jivonaxadu/yhjHkBl/jurassic_worldtm_the_game.pdf
    • https://static.s123-cdn-static.com/uploads/4391037/normal_6007fba127afd.pdf
    • http://zivemigidefis.mypressonline.com/23774257281.pdf
    • https://cdn.sqhk.co/rosojolude/anD26ij/amazon_kindle_account_forgot_password.pdf
    • http://xebupado.mypressonline.com/what_is_ethnography_in_anthropology.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fejatepudopito/79480953478.pdf
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_e031c3f029714bca954989fea1fcc8e4.pdf?index=true
    • http://dajomilot.atwebpages.com/sat_subject_verb_agreement_practice.pdf
    • https://s3.amazonaws.com/kegovev/capella_university_nursing_informatics_review.pdf
    • https://s3.amazonaws.com/wizakokowe/how_to_become_a_cosmetic_dentist_in_canada.pdf
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_99605972cf9443788b91025e55c0b310.pdf?index=true
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_2c6c8c18bbfe42e5b645d6961445ca3f.pdf?index=true
    • http://nejesezape.myartsonline.com/putajoxilinuwavakeg.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_off0000fb26.bin
fcd099d8f5173734dee2114f2b6b36eeb22d9a334ed1ae51472220883a863f7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 5748 bytes
font_01_sfnt_off00010eb1.bin
9244ecb88c0c342df311cf3458ae0691c18cfc69b999b44a7d57e56b547d56d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB1 10700 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.