Malicious PDF — malware analysis report

Static analysis result for SHA-256 841be84ca8b0aa3a…

MALICIOUS

PDF

84.4 KB Created: 2021-03-01 17:17:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6cab268c6cb81fa58c4bf0218a22d9d SHA-1: e85a1f0d636e333a48929a6693968528c0be252d SHA-256: 841be84ca8b0aa3a1e50f9e1fe4c96edee1078a069f21886def09f31a5c20d56
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=little+house+on+the+prairie+season+6+episode+10
    • https://midumelu.weebly.com/uploads/1/3/4/3/134341446/5309019.pdf
    • http://rubewox.sportsontheweb.net/vizio_smart_tv_e601i-a3_firmware_update.pdf
    • https://cdn.sqhk.co/negolura/gghahir/the_dictator_netflix_australia.pdf
    • http://gapagal.mywebcommunity.org/ca_dre_rental_application_form.pdf
    • http://kojijeku.mygamesonline.org/todexaxime.pdf
    • https://cdn.sqhk.co/moxulofilose/gigdieJ/10268769396.pdf
    • https://cdn-cms.f-static.net/uploads/4369331/normal_60241b4d28512.pdf
    • https://cdn.sqhk.co/bipufawawi/gc8jcgh/74058485547.pdf
    • https://cdn.sqhk.co/semiwewedazi/Mhfgjjb/9776122528.pdf
    • http://wugupomovupa.sportsontheweb.net/dezuxukajageju.pdf
    • https://static.s123-cdn-static.com/uploads/4471704/normal_600385a49d37f.pdf
    • https://static.s123-cdn-static.com/uploads/4408001/normal_5fcf212747856.pdf
    • https://static.s123-cdn-static.com/uploads/4492575/normal_5ffb300098175.pdf
    • https://cdn-cms.f-static.net/uploads/4458145/normal_602412e7e0a9c.pdf
    • https://cdn-cms.f-static.net/uploads/4501810/normal_5fd0f9b905bac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rabatelekovufar.myartsonline.com/how_much_do_pr_managers_make.pdf
    • http://xuvekixofeku.onlinewebshop.net/99200392693.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f43b.bin
1e7517d01e4f33301e04efbd092bfddecf87b74a15dd1031a7fbdc43de9e0a10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 5336 bytes
font_01_sfnt_off00010657.bin
18b40e449a7b6aacbfd4298f8e3c12a0843bba7911a0381f49fab863b773e45e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10657 11364 bytes
font_02_sfnt_off00012c82.bin
1c6f7bae58c28f2a697bc88b70ef5fbd960aa96547c365dda085e6a73f0d5487		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C82 17484 bytes

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