PDF malware analysis — malicious · 361dc61c098e3a9d

MALICIOUS

PDF

75.5 KB Created: 2021-09-14 13:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27

MD5: fe25bee899848e3cc205d41327825549 SHA-1: b4844f4639186c2c4a2ed37f31f3a57c2a0ce552 SHA-256: 361dc61c098e3a9da9e29a815c7c36816579b1a8f75cdebebee84a88b2de6d7f

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a large number of external URIs. The PDF document body is heavily obfuscated, but the presence of embedded JavaScript and numerous links suggests an attempt to redirect the user to malicious sites, likely for phishing or malware delivery. The URLs extracted are diverse and point to potentially disposable hosting, consistent with a link farm or phishing campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=harry+potter+and+the+goblet+of+fire+ppsspp PDF link annotation
- http://saydersan.com/firma/files/tuvajokiranuxidim.pdfIn PDF document text
- http://rovitek.com/userfiles/file/nixefubedagumoripelumul.pdfIn PDF document text
- http://hvpeds.com/upload/contents/file/sibefojemobijefet.pdfIn PDF document text
- http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/80999779628.pdfIn PDF document text
- https://minervatech.work/js/ckfinder/userfiles/files/53574392758.pdfIn PDF document text
- https://efckrakow.pl/userfiles/file/pufimilabovejan.pdfIn PDF document text
- http://abwninemile.com/uploads/files/58717879091.pdfIn PDF document text
- http://idealthailand.com/file_media/file_image/file/puluka.pdfIn PDF document text
- http://tko.wavedev.net/img/files/files/kozoworataruxekumamatagag.pdfIn PDF document text
- http://sjanzee.nl/file/91238336353.pdfIn PDF document text
- https://hram-uspeniya.ru/ckfinder/userfiles/files/61729255402.pdfIn PDF document text
- http://g-shocktou.com/user_file/file/mekopojurid.pdfIn PDF document text
- https://dobski.pl/userfiles/file/57129371395.pdfIn PDF document text
- https://tenfci.org/userfiles/file/rijijizivana.pdfIn PDF document text
- http://monikaknoblochova.com/userfiles/file/89422252562.pdfIn PDF document text
- http://epmresearch.org/userfiles/files/70887651880.pdfIn PDF document text
- http://nfc.soo.jp/file/56572040816.pdfIn PDF document text
- http://www.jindatunnel.com/up_files/file/xalimanodin.pdfIn PDF document text
- http://xn----7sbjvweekof5d.xn--p1ai/files/files/47947123435.pdfIn PDF document text
- http://jiachuankeji.com/upload_fck/file/2021-9-14/20210914020539864775.pdfIn PDF document text
- http://aci-immobilier-douai.fr/userfiles/files/54884157751.pdfIn PDF document text
- https://www.koreayokogawa.com/ckfinder/userfiles/files/30901764152.pdfIn PDF document text
- https://jungleflightchiangmai.com/Uploads/files/resufemedafokosug.pdfIn PDF document text
- http://pincodehub.in/userfiles/file/lozodajowirelinaboxonak.pdfIn PDF document text
- https://gtijsr.com/userfiles/file/begatemapefavasu.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_off0000c234.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC234	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000da46.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA46	17276 bytes
SHA-256: `7b8bf82b809a55f83475f5732d5b113c2916fe37feb87a5f83913207e508c11f`
`font_02_sfnt_off000106e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106E9	11020 bytes
SHA-256: `60ada8282d0e094356b332cfa704ea8bfca376b83ad790a6b85486112dd49021`

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