Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6d95aaa9f28cf4…

MALICIOUS

PDF

70.2 KB Created: 2021-09-23 20:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a7d0a62ba2b80e84b49ec50d3893de3e SHA-1: d1470564498c413bd4a1c6bf755d51aea8372d05 SHA-256: 8e6d95aaa9f28cf40a549832ba3b7fbbc6118e889d85890cf0931121ceb312d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as an external URI likely used for redirection or phishing. The PDF structure and the presence of embedded URLs suggest it's designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=the+speed+of+a+train+increases+at+a+constant+rate PDF link annotation
    • http://unibeauty.com.br/ckfinder/userfiles/files/48906214490.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/73521325187.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161479dae37fc2---84382822262.pdfIn PDF document text
    • http://secretinvitation.net/images/files/58756875943.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141ad3e07b80---meribirukizere.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/fuwabedi.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/52571757954.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/manoriwokes.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/feguki.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210912131635.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/15919828294.pdfIn PDF document text
    • http://rvhifi.cz/files/file/2098263064.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/soxelewukinu.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/50699217627.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/10011149253.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/20877549259.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/momixofisuzujidifegam.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/50295314356.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/19169827854.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/86367355244.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/63593985002.pdfIn PDF document text
    • http://exima.kr/userData/board/file/7237667782.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/gebalapewifegofovodebi.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/57062742803.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.

FilenameKindSourceSize
font_00_sfnt_off0000b4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A8 10636 bytes
SHA-256: e7e1e7348a23d7d3636570bd0e40e327d144e0838e86936cf9f59826395e9327
font_01_sfnt_off0000ccf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF6 14844 bytes
SHA-256: e0da20fb995d534ee4caa6987566fab3699d85db906ee489364dcd41569a4ddc
font_02_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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