Malicious PDF — malware analysis report

Static analysis result for SHA-256 1105eb3fc121cac7…

MALICIOUS

PDF

75.9 KB Created: 2021-03-26 00:50:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 976a23359f7a3b5f15709e7c64b6cc7d SHA-1: 39d2f3d7478de7039ce3597f89c816a1fbd9c752 SHA-256: 1105eb3fc121cac7f8c208385ba43d8ad4eb598831585d16d2be7b48f44f2fc2
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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.
  • 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://druttle.ru/strik?utm_term=jeux+de+carte+personnalis%25C3%25A9+recto+verso PDF link annotation
    • https://wisenuru.weebly.com/uploads/1/3/1/8/131856959/a8247.pdfIn PDF document text
    • https://bazatodeniwumov.weebly.com/uploads/1/3/0/7/130739274/robuwek_xiwupugapajiji.pdfIn PDF document text
    • http://texewofe.22web.org/zusovigalimuse.pdfIn PDF document text
    • https://migufakugiguxob.weebly.com/uploads/1/3/4/5/134579218/4d8a81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501028/normal_603b42a9d1f8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402949/normal_5fdd9ccdbc6d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408172/normal_5fe396a342748.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452373/normal_5ff2a1c722c45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402720/normal_5ff8b61d64b78.pdfIn PDF document text
    • https://viropozokuputaj.weebly.com/uploads/1/3/4/4/134441516/sowen.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/lowebemuwojiso/mezidosasog.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/evanescence_my_immortal_piano_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/acute_ischemic_stroke_guidelines_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/nekowur.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/33762426549.pdfIn PDF document text
    • http://xesesezaxemu.epizy.com/promissory_note_form_new_york.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/cds_examination_form_fill_up.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_off0000e8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E3 5328 bytes
SHA-256: 30f2dae035af6bfec21c6e17d4d0a76ede8bad049defa93327cce4d4981a09ac
font_01_sfnt_off0000fad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD1 11900 bytes
SHA-256: cb21e871bb0c303d8a381aa50b34058c0458e21302603a729176ccb6ab2f2804

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