PDF malware analysis — malicious · 8876f628d9479303

MALICIOUS

PDF

73.3 KB Created: 2021-09-27 04:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: a365426411f38cdeb39f952b88825c66 SHA-1: 1a441be46db174efaa86d0811a2f37788e32ccce SHA-256: 8876f628d9479303242205de05d30136d96ce9154643088d1f6f983fb1f61b32

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

Heuristics 6

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.
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://kondicionery-elektrostal.ru/upload_picture/file/46099882902.pdf In PDF document text
- https://dm288.com/slicice/file/89717677924.pdfIn PDF document text
- http://homelife-superstars.com/image/files/38134429311.pdfIn PDF document text
- http://rujiahk.com/uploadfiles/file/zukoleb.pdfIn PDF document text
- http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/kalugodupelopukipusa.pdfIn PDF document text
- http://administratieindex.nl/images/uploads/zazofinebotavisasonax.pdfIn PDF document text
- https://harshahometutors.com/uniformkontakt/userfiles/image/files/93677021364.pdfIn PDF document text
- http://tuzoltosagmihald.hu/userfiles/file/20528958702.pdfIn PDF document text
- https://kaparatt.com/images/File/45243228211.pdfIn PDF document text
- http://abyss.sk/userfiles/file/99867971163.pdfIn PDF document text
- http://kwiatmetal.pl/userfiles/file/20611913532.pdfIn PDF document text
- http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161356ad73adf3---55237318278.pdfIn PDF document text
- http://kaizenlife.com/ckfinder/userfiles/files/54586634904.pdfIn PDF document text
- https://skinrepublic.vn/webroot/img/files/xomeneki.pdfIn PDF document text
- https://konzolstudio.ro/uploaded_files/file/sogipizoregilebowokafopiz.pdfIn PDF document text
- http://sethhukumchandschool.com/userfiles/file/11371965881.pdfIn PDF document text
- https://dukra.sk/editor_uploads/files/mowujudunofenewesuwarifad.pdfIn PDF document text
- http://musclecar-taps.com/js/upload/files/20094199111.pdfIn PDF document text
- https://chambres-hotes-aube-bleue.fr/userfiles/file/22824210110.pdfIn PDF document text
- https://studybrilliant.online/app/webroot/img/userfiles/file/jolusatuwudanilig.pdfIn PDF document text
- https://8cj2aja7-8mxb.com/contents/files/rapegowalegekilomejeru.pdfIn PDF document text
- http://ancheng-medical.com/uploadfile/files/bokimun.pdfIn PDF document text
- http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16146b6be90433---68065622046.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=abstract+algebra+john+b+fraleigh+pdfPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b5c2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB5C2	11152 bytes
SHA-256: `f82e95566ccf3a5f94c2b5617b0c71e9ddf4d1414145b6c5f205f80d557bbe8f`
`font_01_sfnt_off0000cf57.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF57	18672 bytes
SHA-256: `62bb131a757071157a7f624e96c8a01b5061374e916fa874e92c2b2cc09181c6`
`font_02_sfnt_off0000ff90.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF90	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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