PDF malware analysis — malicious · 23da1814f3e3fae8

MALICIOUS

PDF

90.8 KB Created: 2021-09-20 05:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 8d0e787e886370e9f925263d10fbb636 SHA-1: 6cc433162e811bc8ca653b90fc21ab6dbf760f90 SHA-256: 23da1814f3e3fae8e842a3f21756e18348c3293c41b2c34370ed2e8c1b827656

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URL distribution are consistent with attempts to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9902

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://bischofs-scheune.de/userfiles/file/bezinosefotatosoxotogu.pdf In PDF document text
- http://hoanhaochemical.com/uploads/files/vakizuxetixej.pdfIn PDF document text
- http://hotelbelleepoque.bg/userfiles/file/99834532535.pdfIn PDF document text
- https://alhurwallpaper.com/Files/files/fofoxixazonakute.pdfIn PDF document text
- http://rrmkaryacollege.org/rrmkarya/userfiles/file/mubatezipowe.pdfIn PDF document text
- http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe69b966bc---20695125335.pdfIn PDF document text
- http://www.recko.ru/ckfinder/userfiles/files/59103239512.pdfIn PDF document text
- http://akinmedical.com/uploads/file/koxufatejirut.pdfIn PDF document text
- http://vsrru.ru/userfiles/file/wuxixinenalekojatunuru.pdfIn PDF document text
- https://toptenstudy.com/upload/files/BodyFile__613DEB87E362B.pdfIn PDF document text
- https://booking-news.hkdnracing.com/webroot/editor-uploads/files/vapufuzuvu.pdfIn PDF document text
- http://auswallendorf.de/userfiles/file/funoxewujoved.pdfIn PDF document text
- https://rosedreamholidayhomes.com/ckfinder/userfiles/files/mufositowarozebe.pdfIn PDF document text
- https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/8fd454dd620fc2c5b60a1d8d204b3e38/zisuniwinewuwixolulen.pdfIn PDF document text
- http://innotack.com/userfiles/files/93179781387.pdfIn PDF document text
- https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/18817924132.pdfIn PDF document text
- http://nexxstep.nl/userfiles/file/36947244651.pdfIn PDF document text
- http://prabashproperties.com/ckfinder/userfiles/files/gituda.pdfIn PDF document text
- http://ronaldtan.nl/images/photo/ruxizamula.pdfIn PDF document text
- http://rrbrentacars.com/files/others/88847073124.pdfIn PDF document text
- http://dajuicebarus.com/uploads/files/45576705605.pdfIn PDF document text
- https://verner.lt/images/files/68844875899.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=where+the+wild+things+are+book+read+onlinePDF 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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d1ec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD1EC	24124 bytes
SHA-256: `42987565e0b830f06858013a78d081667c3a15339b9349203e23f2b92024312d`
`font_01_sfnt_off00010d84.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D84	10840 bytes
SHA-256: `e61f49dff37d3223d60b3a6bd27d1e0a0a074bf715c1387c6e539d493228ce9f`
`font_02_sfnt_off0001264a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1264A	16244 bytes
SHA-256: `fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d`
`font_03_sfnt_off00013c2f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13C2F	1784 bytes
SHA-256: `fca9f8450e1a544ab43b6b7fbe967452567be0f6c717d6b9cf2fcf5323db9044`
`font_04_sfnt_off0001449d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1449D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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