Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26087f92b8c7d56…

MALICIOUS

PDF

69.0 KB Created: 2021-09-29 14:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 830ef3e0225b08844c28cc262a083669 SHA-1: 0c5202b8dadc4c90320bbb6698d3a8cff87eaa54 SHA-256: e26087f92b8c7d5636bf2e22ab1b983648ed157dab85d981c2590ae9b2639f8f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as evidenced by the numerous 'unknown' reputation URLs found in the document, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kammerchor-lindau.com/file/fetulaxaxuluros.pdf In PDF document text
    • https://jotekonybakterium.hu/userfiles/files/moxulona.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/faparilorije.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/41806154462.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/70517981007.pdfIn PDF document text
    • http://generoussecurity.com/uploads/77047209125.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/45230941824.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/38068505080.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-26/20210926051536371929.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/xewenodawejag.pdfIn PDF document text
    • http://aid-calais.com/userfiles/file/26222333863.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/patikozigiwabu.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/vutejijegoguvexosena.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148533796ff7---xasafifabinuzuro.pdfIn PDF document text
    • http://grandfiltr.com/files/file/49584403679.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/73183629085.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/buzezenijob.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/galojewejarev.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615034281557c---wizumegetazariziravomaz.pdfIn PDF document text
    • https://tavio.ru/files/file/denipuvujonazebesa.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/69395563161.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/42918418536.pdfIn PDF document text
    • http://ore-processing.ru/d/files/68308183746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=dating+sim+games+pornPDF 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_off0000b085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB085 10552 bytes
SHA-256: 7e250c0251115ba74034dda36f9d9e18d060c9f889e5d072da270d56e9ec6e44
font_01_sfnt_off0000c88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88C 14496 bytes
SHA-256: a7d1ec81ee5da0538c05db428ed72e58bc663da85d06658428ceeebfc7db04c5
font_02_sfnt_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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