Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb662eddddf1c1b5…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 10:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 38edd5f298be8832e3ba6f93038c54cc SHA-1: 21438e9438d41cb055676e4c5eaa755566f597a0 SHA-256: eb662eddddf1c1b5ba34405955a142301e9d0ceed916bd61a11cdd5d0aa941f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, pointing to numerous distinct hosts, likely to obscure malicious activity. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://noithatsah.com/webroot/img/files/50390907398.pdf In PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/50586239495.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/xevugevuvexinuxu.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/23086318744.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/34787180603.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/45946995965.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/19827692618.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/42754888026.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/67604083741.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/5919835985.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/95290286299.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/wirakibidoxulelidefilo.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219171033514143.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/nuzopegunowamu.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/vezozumumalexadefi.pdfIn PDF document text
    • http://sartor.ru/upload/files/31210706987.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/22913280788.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/xofezifu.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210909_0F63499F5D28A423.pdfIn PDF document text
    • https://bloc-immo.com/images/juzupivudujolapale.pdfIn PDF document text
    • http://jfe.hk/userfiles/nuwulinoluzexi.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/14827091243.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090411213846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=simcity+build+hackPDF 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_off0000d8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FE 10532 bytes
SHA-256: e60a872e3aaaba4dcdd29df70aaec3e806677667c4be597b95166c869415ab03
font_01_sfnt_off0000f100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF100 17668 bytes
SHA-256: 61ce83693b5212d0bf4d2e1ca7f326c1c46d19d2e22a2e16c7595afcc4793353
font_02_sfnt_off00011eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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