Malicious PDF — malware analysis report

Static analysis result for SHA-256 945b9c84c169f9db…

MALICIOUS

PDF

83.0 KB Created: 2021-09-09 03:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c3282ffeaa6b4f48edfeeec1b8dcb8bb SHA-1: 9a093f4812e430f190d65aeddaf13cbcdf1e52ed SHA-256: 945b9c84c169f9dbcd8ebe89b10db1e87297aef96c03e680afe172379ab9bccf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high likelihood of this being a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/uhd1f84n76dibok2f3ds1j7ekt/1130417308.pdf In PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/jenugifosebuvejor.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/boruzimifonusezav.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210905181313.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109021152359440.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/2605396338.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/zixagaxusabubulepe.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/93107507868.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/xatemizixutes.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/roxoresifogupaw.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613927cb0c393---karagodajinexodirov.pdfIn PDF document text
    • http://handgun.ee/media/file/zutijaduneruralesiduwowa.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/gopowufu.pdfIn PDF document text
    • https://rotitelor.com/contents/files/wuriworamumatoru.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/rabobe.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/mujegosiriju.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/30927658109.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/namafokowemarixopu.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/8878197380.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/94908685148.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/29401656.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109080351532619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+king%27s+avatar+2019+episode+1+english+subPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB54 1972 bytes
SHA-256: 9638a3543175fbb085237410495ff39960c9d1af7433f4d70609fc55329ad359
font_01_sfnt_off0000d480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD480 11528 bytes
SHA-256: ae2106ffcadbd5006b9950de356d1f5be304e22c027050ff47c1d57062a61e2d
font_02_sfnt_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001078d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078D 19772 bytes
SHA-256: c6788721b6889a3a7b129e74ffcaa30e56f80bd8a0962ddeaca59ec3d2e39f0e

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