PDF malware analysis — malicious · ac83316b2a638cb7

MALICIOUS

PDF

70.1 KB Created: 2021-09-30 23:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 1085dc379f15f66c3b4567663d216add SHA-1: 69a28965a361a2c0055287babfcb51ed474d632a SHA-256: ac83316b2a638cb7a78cbfe1d1080faf7128369a62171e89867e5128bab1866c

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use for executing malicious actions within the PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 https://pistant.ru/uplcv?utm_term=blue+sky+4k+wallpaper PDF link annotation
- http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/32764729440.pdfIn PDF document text
- http://tao-ssct.org/data/upload/file/14712871096.pdfIn PDF document text
- http://sriraghavendratemple.com/ckfinder/userfiles/files/nexemu.pdfIn PDF document text
- https://lanegarrett.net/userfiles/file/levenevikomenok.pdfIn PDF document text
- http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/mejesinujafevuvoluvimis.pdfIn PDF document text
- http://bearings-home.com/userfiles/file/towuvazelibetig.pdfIn PDF document text
- http://splhardware.com/UploadFile/file/2021092123043573499.pdfIn PDF document text
- https://grafconsulting.pl/Upload/file/fusezut.pdfIn PDF document text
- http://drivingtesttips.ie/fckeditor/userfiles/file/fowadazuke.pdfIn PDF document text
- https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/dabikutogamor.pdfIn PDF document text
- https://ataru.site/js/ckfinder/userfiles/files/84265444900.pdfIn PDF document text
- https://history.tlshaa.org.tw/ckfinder/userfiles/files/15969453836.pdfIn PDF document text
- https://siahotel.com/userfiles/files/linobanimorine.pdfIn PDF document text
- http://maturitni-ples.eu/UserFiles/File/giwepotelesuvexiliw.pdfIn PDF document text
- https://duel.pl/userfiles/file/jinabuxodasuk.pdfIn PDF document text
- http://professional-tuner.at/uploaded/file/98989763734.pdfIn PDF document text
- http://mqskin.com/luutru/files/44829341433.pdfIn PDF document text
- https://eatorhours.org/e-bussiness/fckimages/file/27113050549.pdfIn PDF document text
- https://malayalamfoundation.org/admin/my_files/file/kumizipabulopefe.pdfIn PDF document text
- http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/92270829106.pdfIn PDF document text
- https://www.willmarareachamber.com/ckfinder/userfiles/files/dovusutaxajev.pdfIn PDF document text
- http://tachikawa-derma.biz/ckfinder/userfiles/files/dipojerepap.pdfIn PDF document text
- https://buka.ru/sadm_files/54811682963.pdfIn PDF document text
- http://olech-rzeszow.pl/userfiles/file/67220668016.pdfIn PDF document text
- http://litho-and-co.fr/ckeditor/upload/files/zigajalebavejaw.pdfIn PDF document text
- 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_off0000b41e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB41E	14956 bytes
SHA-256: `a6297e6922e6d861cc82f5b6af941e3d9a45c920312237bd21f7dc47f59ec568`
`font_01_sfnt_off0000da7a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA7A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f291.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF291	10356 bytes
SHA-256: `76edefce2a9b10330ffaded0986772490476e5bcb82d3d0e23e4c16deb4c8264`

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