Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4216951e202ea9e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 22:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3ce3b6ffd99cf7309c268969835093e SHA-1: 5e3262e540c32d0272aedc3603aaf7fbd636624d SHA-256: c4216951e202ea9e636ab8ef93cac6a96207bb97e41eeea495b482a65bd985be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=hero+academia+season+5+episode+15 PDF link annotation
    • http://freewest.at/genelir.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/zazelamiw.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/96629242972.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210905215923.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/24175676845.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/91880556672.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/1781336362.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/vexuziwesagugigigonoser.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/13354133792.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/61893616333.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/sozaxefuniwu.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/sofelelorivinovozoxij.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/bowudusagowetuloz.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/dawepomi.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/85910460425.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/26479485864.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/18067410662.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/12383957684.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/22268923951.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/gonamobefifejixa.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/6034462581.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/kupilapaziwogiwefepogozus.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/22829025037.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/kiluvigepogojuko.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_off0000d9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EE 18312 bytes
SHA-256: a70f82704649d0b52b2e3c07eb90bffd2399d914826e2adc5545103f8dbae53c
font_01_sfnt_off00010a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12250 10708 bytes
SHA-256: 4c85fb30fa2575b7dbb7774728c4ab6e00b310162d3eafe6f4748ab05b19a898

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