Malicious PDF — malware analysis report

Static analysis result for SHA-256 e154525ed0c656b8…

MALICIOUS

PDF

79.6 KB Created: 2021-04-02 15:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4bac2fe34a4000484b3929bc4668aab SHA-1: 8824ce5a47b14a587cdf482a09d7a41609736ed7 SHA-256: e154525ed0c656b8480f0353506f18cbe5c242bbde48b5ad633d4c79fec5fcc3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a scam. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/strik?utm_term=how+to+activate+automatron+dlc
    • https://static.s123-cdn-static.com/uploads/4417995/normal_5fefaa1741331.pdf
    • https://cdn-cms.f-static.net/uploads/4421341/normal_6019d4dbda35b.pdf
    • https://cdn-cms.f-static.net/uploads/4376101/normal_601b1c3796f33.pdf
    • https://static.s123-cdn-static.com/uploads/4489975/normal_5fff1ac2cfc56.pdf
    • https://timemojorejo.weebly.com/uploads/1/3/1/4/131437846/0e0471.pdf
    • http://premiumpornclips.com/gagaxamw3mhl.pdf
    • https://cdn-cms.f-static.net/uploads/4475209/normal_5fd747c75b503.pdf
    • https://pixofanipadolu.weebly.com/uploads/1/3/5/3/135326367/depaw-nakedotujofil-julexenobis-siton.pdf
    • http://mysteps.online/nordyne_gas_furnace_ignitorfrrsv.pdf
    • https://cdn-cms.f-static.net/uploads/4390095/normal_603db8963fac1.pdf
    • https://static.s123-cdn-static.com/uploads/4420432/normal_5fce43eb1726a.pdf
    • http://imkl-checker.com/212961553890m25l.pdf
    • https://static.s123-cdn-static.com/uploads/4402718/normal_5ffc28e34676d.pdf
    • https://naluzakagowu.weebly.com/uploads/1/3/1/4/131411806/adae31d2ba4b.pdf
    • https://cdn-cms.f-static.net/uploads/4370057/normal_605d8782c6348.pdf
    • http://eagleaff.com/fundamentals_of_investing_13th_edition_freeyvwsx.pdf
    • http://sreda.city/singular_and_plural_nouns_worksheet_for_grade_23wlxu.pdf
    • https://vosikobogoj.weebly.com/uploads/1/3/4/2/134235386/vegeri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tujeviwakirawu/dobapipizugemovobigejogu.pdf
    • https://s3.amazonaws.com/tikofaketonub/vodev.pdf
    • https://s3.amazonaws.com/tetenifeme/pefepijixular.pdf
    • https://s3.amazonaws.com/wegemebufojafak/46420935361.pdf
    • https://s3.amazonaws.com/wibadinavosunom/60359739830.pdf
    • https://s3.amazonaws.com/zodererezuzuxi/does_walmart_exchange_sodastream_co2.pdf
    • https://s3.amazonaws.com/pazovugal/ratos_annual_report_2007.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_off0000f8bb.bin
6bf4d2f8aef763a1c11651d551002f0f88a5160e12d59022e97ffabc1c54d576		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BB 5020 bytes
font_01_sfnt_off000109c9.bin
ba3cb61ef1baac60bbe14f1a25d83d2c5863c4a3f43f1fb8772b9dd791d810f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 11320 bytes

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