Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7fa9f894eeac48c…

MALICIOUS

PDF

71.2 KB Created: 2021-09-29 01:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1c0083352b95b0cdf8f41a3616698ab SHA-1: b3147b8a7e209191a98ddd2efc37ea912719daea SHA-256: d7fa9f894eeac48c657b45ab6c453e9babb0bdfd8026f0eb0b75a5940c4a0313
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host numerous links, likely directing users to malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving redirection to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 http://shqinze.net/admin/upimg/file///2667710141.pdf In PDF document text
    • http://salman-is.com/userfiles/file/42827618340.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/14118311758.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/10l00e9g4b01ufog8esvn6i44q/3799586639.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/50450021039.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/613425286.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/ditetagur.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/95162363541.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/savufidux.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/32632632430.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/57419652400.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/47996463310.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/vonavenuwugigadedi.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/73212702418.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/jadawixuzus.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/39274860100.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/dopijegejaregesitatali.pdfIn PDF document text
    • https://paperland.bg/uploads/file/lupowutunalawulilexifux.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109161924128377.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/fifakofateb.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/6337392216.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/subatemiwaputorobi.pdfIn PDF document text
    • http://saowaneecamp.com/UserFiles/file/dutejup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=my+tablet+will+not+connect+to+the+internetPDF link annotation
    • 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D8 17620 bytes
SHA-256: 739ca49877e75e9af68e95e749ceae2297adaf307846c0ce57df73a2317de01b
font_02_sfnt_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 10492 bytes
SHA-256: 9d7956ab0c457f4c22dc398b2299e5f008abae9193b536c2812c9914c21863a2