Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4bf538d65c2c92…

MALICIOUS

PDF

77.9 KB Created: 2021-03-22 04:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff18321256864970b01e430734ad6326 SHA-1: ed65418ccf52a63b963310cdc4947b72a6512071 SHA-256: fe4bf538d65c2c921da2d66349f7b530718ea207cd17ed9494db61ac342989a8
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 point to PDF files on various domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nipisod.ru/wix?keyword=chapter+1+science+skills+worksheet+answers
    • http://bt-management.website/vewinizaratukewobus25bc.pdf
    • http://prizinsta24.site/papavurixemuzagefisasave2chdp.pdf
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/delonghi_ec702_best_pricepe4kt.pdf
    • http://fabermanufacture.ru/english_classics_booksr56sp.pdf
    • http://helpforteam.com/frigidaire_washer_and_dryer_stackable_kitofzj1.pdf
    • http://50offshop.info/do_native_american_tribes_pay_taxes4odq5.pdf
    • https://vazanopika.weebly.com/uploads/1/3/4/8/134896022/7159418.pdf
    • https://jinidodax.weebly.com/uploads/1/3/0/9/130969434/db6b2942de7f.pdf
    • https://cdn-cms.f-static.net/uploads/4488604/normal_603bd96f567c2.pdf
    • http://faceit.su/pk_tC3BCrkC3A7e_dublaj_indir_1080pp48v4.pdf
    • http://leomannapov.com/benaxevafeleluvekonugi5ripr.pdf
    • http://iminn.ru/78106737597l2yl0.pdf
    • https://cdn-cms.f-static.net/uploads/4424007/normal_60206139218f5.pdf
    • https://jelifamije.weebly.com/uploads/1/3/4/3/134320618/0a8511b1e.pdf
    • https://kisisixixugejo.weebly.com/uploads/1/3/0/9/130969502/vaviverorafobabijan.pdf
    • https://cdn-cms.f-static.net/uploads/4422147/normal_6041bc2b1b6da.pdf
    • https://static.s123-cdn-static.com/uploads/4402252/normal_5fe5e614aa694.pdf
    • https://static.s123-cdn-static.com/uploads/4444351/normal_6008f673d5172.pdf
    • https://cdn-cms.f-static.net/uploads/4471083/normal_60286a51a9cba.pdf
    • https://static.s123-cdn-static.com/uploads/4474999/normal_5fde088f53c80.pdf
    • https://xemudimiju.weebly.com/uploads/1/3/4/8/134861016/c5295249c99f9.pdf
    • https://cdn-cms.f-static.net/uploads/4382639/normal_6021f8cd8daa0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_1cc8316135624dbe991339d7b44be71a.pdf?index=true
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_fe25ae72ccc040cb994d083a628e522b.pdf?index=true
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_9d69be7276664240932f333cdb2eeb12.pdf?index=true
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_4efa7de2944d474c8369094fb4490799.pdf?index=true
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_c5ffc7ddf02b429ca81e56236905deaa.pdf?index=true
    • 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_off0000f45a.bin
581fd7cfce25aab6c31fba890512348abd29256c2e9e6a5cce65a590cb1968a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 5132 bytes
font_01_sfnt_off000105dc.bin
b091f0aa05b83d5270fd7c123aa77a77f39ec5995747d320ee5acdad81049b1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 10540 bytes

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