PDF malware analysis — malicious · 37035278e588f424

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 22:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 97daeec7fe163e046a9992fd57f1a4be SHA-1: dbb4c4ca28c5acfac1873913a806c52b110a60b3 SHA-256: 37035278e588f4242249e9c51d3441f4ee2b1c53431ef8fd0dd9ae29a0afcd2f

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm pattern, suggesting a phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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 https://philabc.ru/uplcv?utm_term=chrome+default+settings+android PDF link annotation
- http://gesundezellen.de/neu/userfiles/file/pedumi.pdfIn PDF document text
- https://bunianco.com/other_files/File/mozanibipugu.pdfIn PDF document text
- https://360clothing.in/home/www360cl/public_html/uploads/images/files/2059286370.pdfIn PDF document text
- https://clap-bas.com/userfiles/file/45055378813.pdfIn PDF document text
- http://pokorny-podlahy.cz/UserFiles/File/sejasupotolugim.pdfIn PDF document text
- http://ppogrimall.com/upload/editor_image/file/88009826288.pdfIn PDF document text
- https://prcomponents.com/ckfinder/userfiles/files/koronuwakosukuwe.pdfIn PDF document text
- https://100tmt.com/uploadimage/files/20210908045123.pdfIn PDF document text
- http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb1fcbc4e---pegawadenesabowibozul.pdfIn PDF document text
- http://commune-bourre.com/userfiles/file/10041662560.pdfIn PDF document text
- https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133fa5615d46---dopavanikovezan.pdfIn PDF document text
- http://jts-electrical.co.uk/ckfinder/userfiles/files/dukidu.pdfIn PDF document text
- http://knauto.com/upload/file///37199362243.pdfIn PDF document text
- http://globalsublimation.net/uploadfile/files/38578429820.pdfIn PDF document text
- http://balone.net/_upload/file///52569930000.pdfIn PDF document text
- http://floridadressyourhome.com/uploaded_files/userfiles/files/sarerabimuf.pdfIn PDF document text
- http://hoachathoanggia.com/userfiles/file/92446049446.pdfIn PDF document text
- http://www.afurg.com.br/assets/ckfinder/userfiles/files/gixilujanojowir.pdfIn PDF document text
- http://files.ibiza-ferien.de/file/masuju.pdfIn PDF document text
- http://dentali.cz/files/files/11317566833.pdfIn PDF document text
- https://chulintemple.org/CKEdit/upload/files/jifukojolusirezo.pdfIn PDF document text
- http://td-mg.ru/uploads/files/6783332592.pdfIn PDF document text
- https://watfordfairtrade.org/app/webroot/img/files/redavejijo.pdfIn PDF document text
- 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d4d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD4D5	18468 bytes
SHA-256: `10b1d90f03c24e06243290d8a85e6873ff6663ff54bf5f25da47a2dbb143ac64`
`font_01_sfnt_off000104ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104EF	10932 bytes
SHA-256: `91a95301a4c6eb4d000857bbc9cb448ad815a8b8f16bf76e2f9b437d9a706058`
`font_02_sfnt_off00011de8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11DE8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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