Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf0a31ca782ed61…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 07:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc3b073072d757dfc85d7f72b81d0545 SHA-1: 86d36b2df1f9104d986093b4c4d71dda4c26039b SHA-256: 1bf0a31ca782ed61e3ad881adab2a670cf4b5a5493c2d46b69d6d8edf2abf5d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ceccarbotosani.ro/userfiles/file/pigesivirikejin.pdf In PDF document text
    • https://daynexweb.com/upload/ckfinder/files/jivevipo.pdfIn PDF document text
    • http://szwygs.com/upload/20438150733.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/60158833949.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/gapegetesuwum.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/66380192047.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/33070886358.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210910030704.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/99585192932.pdfIn PDF document text
    • http://islandpointfl.com/userimages/57499914296.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/tiluxi.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/fedutemapu.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/foxafegikirijekep.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/batubebigokipokojek.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/67732069863.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/kalejaferinibulibu.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/40710722977.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/wadinotagumiralazikinag.pdfIn PDF document text
    • https://salwangurugram.com/files/nigedafufomukevasowakuju.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/vafepijaxiw.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gukaruvufu.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/23018998587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=friends+season+4+online+freePDF 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_off0000dd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 10304 bytes
SHA-256: 7236942f1352a316634459f727f6fe955222068e0f9f8ab39b07a0ce7a1b158e
font_02_sfnt_off00010ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA4 17244 bytes
SHA-256: 48760cb3cd7bbda9cea70497544d5e59afe6fdb4a817c98d228ede6cd83f2723

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