Malicious PDF — malware analysis report

Static analysis result for SHA-256 4198b67908a7049b…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 05:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4257be6f6bf99496e600e21f44268a73 SHA-1: b5b4884fa6423f39c2f0486c253f2b2ffa126a79 SHA-256: 4198b67908a7049b063668a37f44df19d123bec83e4659e6589c3ed0451084b9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, several external URIs point to raw IP addresses and disposable hosting, suggesting an attempt to host and deliver a secondary payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://iknow.pl/files/file/37623110125.pdf In PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/24941783764.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1615251a7608b7---41983819271.pdfPDF link annotation
    • http://3mfa.com/images/editor/files/90387716349.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/nidaxuzapobanu.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/56385339027.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/vawabu.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/diragitili.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/zenida.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/jozipujofiferofabugimimi.pdfIn PDF document text
    • https://cosmetic.dilen.top/upload/files/defoges.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/xifuvupelev.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/32023333181.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/87886658927.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/pudanusiwumogi.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/20557517082.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/ponuvafisuzefoxubulufimo.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/podililukupubedod.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/5352519111.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/terigesezilusunoxafeto.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/95815167500.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/46520342153.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/latawogasabefif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=latest+need+for+speed+for+androidPDF 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_off0000b077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88E 10404 bytes
SHA-256: 4a2da0ec0b9f23d8a0a969c0070adaaaba6c4aa101e68a01168a74dd39fe787d
font_02_sfnt_off0000e033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE033 15788 bytes
SHA-256: dfe261d16c3c7febdc49685a2a270f8c4fa0bfbeaeb946d02f2ce30c2c0faa06