Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67b8bcc8c8fdf9f…

MALICIOUS

PDF

77.0 KB Created: 2021-03-20 19:48:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 68758c9915fb8684c9ccaa9ef92d23d0 SHA-1: 10b57f2ef168f6c517b5b2dd684929c6d7ab3e2f SHA-256: b67b8bcc8c8fdf9f40e167dee934b710553f2350a2804281918b5ab5c31599b6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many of which point to SEO-optimized redirector domains. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a mass of external links designed to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://ponafet.ru/wix?keyword=what+do+barn+owls+in+the+pacific+northwest+eat PDF link annotation
    • https://zikawudewodag.weebly.com/uploads/1/3/4/5/134585044/gijodox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530429/normal_5fd0dc0802849.pdfIn PDF document text
    • https://rezikixudagip.weebly.com/uploads/1/3/4/7/134746502/e63122.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445320/normal_5fef9685170c9.pdfIn PDF document text
    • http://fridgeservice.ru/minecraft_potions_guidevlnd1.pdfIn PDF document text
    • https://wigobozigor.weebly.com/uploads/1/3/5/3/135345973/watipefules.pdfIn PDF document text
    • https://jufufowepum.weebly.com/uploads/1/3/5/3/135348100/978c995c045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476122/normal_601d2ed0abe45.pdfIn PDF document text
    • https://bowefolezoz.weebly.com/uploads/1/3/1/4/131407704/maredo_tesapewamu_talelotupitopob_tigivexov.pdfIn PDF document text
    • http://static-start.top/3535138994kz1u7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403141/normal_5ff543cc28ee3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rizoli/cursive_capital_letters_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/harry_potter_book_set_special_edition.pdfIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_b13cca4c19ec4c88b920e2c92e6f3d34.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ligole/cell_structure_and_function_vocabulary_practice_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/76323173802.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/99839947716.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/braven_brv-_1_speaker_manual.pdfIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_42b0cbccf2de461e945cee0012e88632.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tosevud/tebobi.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/42699455341.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 5488 bytes
SHA-256: 5d10af8089c6c7801d1bfe14992f2c5a7daf4564183f837890ade48f25880298
font_01_sfnt_off00010358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10358 10320 bytes
SHA-256: f93d72079b323e6d4020b6d7c8f7c86ffe361f9a14d0f699807eac4621b7a188