PDF malware analysis — malicious · 4fe066585a9eeb63

MALICIOUS

PDF

85.3 KB Created: 2021-09-12 22:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 405356914c51d27ae434d5b2e70d8d1a SHA-1: d46da05ddc48964fad2377bd5d263c3bc5e4d555 SHA-256: 4fe066585a9eeb639253564ac90055db95b009730603ef14e69c52fc52c75eb7

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the embedded links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=android+phone+hard+reboot PDF link annotation
- http://dpholding.ru/uploads/files/wogokixowidagobetipuko.pdfIn PDF document text
- http://op-gold.com/ck_image/files/25440049289.pdfIn PDF document text
- https://fetogram.ir/images/upload/files/69257231799.pdfIn PDF document text
- http://aan.kz/ckfinder/userfiles/files/88685088287.pdfIn PDF document text
- http://ronaldtan.nl/images/photo/70190865777.pdfIn PDF document text
- http://getampedmag.com/ckfinder/userfiles/files/45206611838.pdfIn PDF document text
- http://lnv-cnc.com/userfiles/file/jemab.pdfIn PDF document text
- https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/621uphi96vc50fm32etc18j6h2/12834363095.pdfIn PDF document text
- https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/lexonizesinatafude.pdfIn PDF document text
- http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/gomewodijotok.pdfIn PDF document text
- https://konyaalotaksi.com/userfiles/file/99239357014.pdfIn PDF document text
- http://dansecyr.ca/pdf/file/41376591433.pdfIn PDF document text
- https://grupo.iberia.es/js/ckfinder/userfiles/files/kezomirafumafozo.pdfIn PDF document text
- https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/5e796050991a60efb443f01cfcfd1bd7/97638362534.pdfIn PDF document text
- http://peach2560.xyz/js/ckfinder/userfiles/files/23123927474.pdfIn PDF document text
- https://posetili.ru/userfiles/file/wepetijobifanotubef.pdfIn PDF document text
- https://palcev.ru/userfiles/file/bibivis.pdfIn PDF document text
- https://mokshadhamnepal.org/userfiles/files/mepenazisenidaf.pdfIn PDF document text
- http://volvo-cars.jp/js/upload/files/jejemasuxebukuvaxujopan.pdfIn PDF document text
- http://pop-around.com/file_media/file_image/file/gulutilisadupekowibumor.pdfIn PDF document text
- http://skidubravy.sk/spravca/ckfinder/userfiles/files/56230292494.pdfIn PDF document text
- https://chennothinterios.com/uploads/file/ludidaxuwekixukofatada.pdfIn PDF document text
- http://taiwangallant.com/uploads/files/202109011321173562.pdfIn PDF document text
- http://ever0036.com/assets/uploads/ckedit/files/20210901172444.pdfIn PDF document text
- https://pnlcoach.com/misc2/file/In 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_off0000e99f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE99F	17832 bytes
SHA-256: `3ebbc036ebf1676c3655ff1162d4465cc4dc073dd09a720d0698fea2a426b6e2`
`font_01_sfnt_off00011834.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11834	10396 bytes
SHA-256: `eba2f01233b7a8ad9c31a90da0bd4f8875b447e60c155437daf53d5afc6aaf81`
`font_02_sfnt_off00012f63.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F63	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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