Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99fdb11ad50114c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 17:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b62f6a183392684a3bbd12338ff3d8c1 SHA-1: 9b9f9102fbd59316ef002fbbc0004878020faa84 SHA-256: e99fdb11ad50114c52cf7e691a8d21946beef7a8230d8e1edd92d28c81a89cf9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that utilizes a link farm and a password-protected archive lure to trick users into downloading a malicious file. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with the ClamAV detection, strongly indicates malicious intent. The ML classifier also flagged this PDF with high confidence. While no scripts were directly extracted, the overall structure and heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://collegium-connect.nl/ckupload/files/vixikejimab.pdf
    • http://xn--aknmedcal-wpbe.com/uploads/file/weleluvimuw.pdf
    • https://landviewdesign.com/userfiles/file/xevazetazov.pdf
    • http://pacemakerpressintl.com/uploads/assets/file/6707159799.pdf
    • https://pharma-tools.eu/galeria/file/nadorupovux.pdf
    • http://ventmetal.ru/userfiles/files/53743365282.pdf
    • http://omatsuri.kr/data/userfiles/files/50891279936.pdf
    • https://marbletreasures.com/uploads/image/files/dimadigivegenafemunula.pdf
    • https://golf-tout-terrain.com/publish/page/file/rowawosupesi.pdf
    • http://ahchala.com/img/file/vafaru.pdf
    • https://inverpalmas.com/aym_image/files/82678460926.pdf
    • http://185.33.116.142/~bbyacht01/upload/files/vuzubetinumegozufomuxe.pdf
    • http://uleshuzatshop.hu/files/file/75988583821.pdf
    • http://thegioioto.store/upload/files/kuxomubujinafu.pdf
    • http://lmtechsolution.com/userfiles/89455444301.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140539b02783---49652028830.pdf
    • http://pzhjintai.com/upload/files/sododosufudawelokujefe.pdf
    • http://alacarte-grafik.de/userfiles/file/sizapodedakutabajusekuti.pdf
    • http://kulturazebrak.cz/userfiles/79871107476.pdf
    • https://hunde-katzen.at/soubory/sosarotajiputodutowubivej.pdf
    • http://virtualcharityevents.com/vce_cake/files/files/pawexasuvixexosareriziku.pdf
    • http://szm.hu/userfiles/file/gupolizujisi.pdf
    • http://arcenevents.nl/site/upload/files/91004210717.pdf
    • https://amursvoidom.ru/media/files/luvexunawoxubumobis.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=proximity+sensor+in+redmi+note+9
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d761.bin
fea78ce49894c3e5b11884ad95278e1650350b5029b80aa4304b28d538c63eb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD761 17772 bytes
font_01_sfnt_off00010569.bin
662576450862688d38dc5b93328b8028c109a80023f78ed41f2110a5a6a55b7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 10584 bytes
font_02_sfnt_off00011da4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 16792 bytes

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