Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e693f497ca92d6…

MALICIOUS

PDF

78.5 KB Created: 2021-09-13 09:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 50028b2179abe429ff82fc355294c0cb SHA-1: 8ee2588b5e29dc2f4d8b5a71be991122a45879de SHA-256: c3e693f497ca92d65a18906da9fd8b1e28b58bb8de0a35d83ca300c46ad02371
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm with numerous external URIs hosted on disposable domains, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable, but the overall structure and URL patterns strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://philabc.ru/uplcv?utm_term=revvl+5g+root PDF link annotation
    • http://ellissi.org/userfiles/files/62118064574.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109060921315742.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/rokowuf.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/99914305582.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/63092487662.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/jesifosigapubepu.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/lipurabamerafo.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/5862923208.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/62028150611.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/tikitevugedirigedopezulu.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d04e2ec3ad---tavenumiko.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/47063320946.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/89673198841.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/2845482623.pdfIn PDF document text
    • http://pi-consulting.ch/download/9013343127.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/tusamufi.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/jipalazizefika.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/15881066225.pdfIn PDF document text
    • http://sushibelovo.ru/files/7922792702.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/49398072267.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/41354275472.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_off0000d034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 10000 bytes
SHA-256: fb8f3ff2e689c8fcbfb87433a7e5057e90a83086cf79728be5f7376112ba1ed5
font_02_sfnt_off0000feaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAA 17640 bytes
SHA-256: 0d6044f16f03f1b61b982ea923c625760bcb7b4385f35bb11e9a32772e8307e3

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