PDF malware analysis — malicious · ad5330335a135100

MALICIOUS

PDF

79.3 KB Created: 2021-09-16 09:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 57fad1daf9b91b79050deaaf11db2838 SHA-1: 3308a1aedad21bcb2c72cb08956f926a78dded6b SHA-256: ad5330335a13510056c00395dc69e2800be3abb48dc2c7860f40d5a7beca2087

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The primary function appears to be directing users to potentially malicious websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 https://crysiq.ru/uplcv?utm_term=movies+online+apk PDF link annotation
- https://alcoquimicos.com/ckfinder/userfiles/files/79454504173.pdfIn PDF document text
- https://signatureshreyas.in/userfiles/file/nofizinugukugizogabuv.pdfIn PDF document text
- http://vektor-bezpeki.com/userfiles/files/bapefebokupu.pdfIn PDF document text
- http://samuiluxurytravel.com/Uploads/file/katuwuresomutuv.pdfIn PDF document text
- https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/fcrujsb2q4khiin4algth95mt1/beriduveguzifaluwis.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c9d7d133bcf280773c798552814187ae/zukumawudakovaj.pdfIn PDF document text
- http://kfoodntea.com/dataroom/file/bodezisirafajodixabowi.pdfIn PDF document text
- http://aapltd.net/userfiles/file/35369973060.pdfIn PDF document text
- http://hoteldarim.ir/basefile/hoteldarimir/files/bojopekulolivesuxi.pdfIn PDF document text
- http://lnshiyue.com/userfiles/file/20210914114832_1868343992.pdfIn PDF document text
- http://yourtruck.be/upload/ckeditor/file/misofuxisil.pdfIn PDF document text
- https://univerosg.com/ckfinder/userfiles/files/sebifusifaxobofora.pdfIn PDF document text
- http://gjbbang.com/userData/board/file/sutezokejiziz.pdfIn PDF document text
- https://gaadalagi.com/contents/files/podetir.pdfIn PDF document text
- http://smsalumni1971.com/apadmin/uploads/userfiles/files/93345334073.pdfIn PDF document text
- https://stillwaiting.org/userfiles/file/pesidemesiseduwikovefupov.pdfIn PDF document text
- http://pc580.cn/upload_fck/file/2021-9-4/20210904104920778564.pdfIn PDF document text
- http://fishtech.org/uploads/userfiles/file/file/66166076766.pdfIn PDF document text
- http://phutungvespaco.com/luutru/files/25399603957.pdfIn PDF document text
- http://ageddfjtj.pretty-match.com/upload/files/82679560849.pdfIn PDF document text
- http://biometria.pl/photos_fck/file/6566322714.pdfIn PDF document text
- http://easytravel63.ru/ckfinder/userfiles/files/nosobopibuk.pdfIn PDF document text
- http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/56708947879.pdfIn PDF document text
- http://forum-auto.ru/data/files/35984589251.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_off0000d259.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD259	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ea6b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA6B	18124 bytes
SHA-256: `1b04998337c60f9071740157bad1f54e3ebc72a2af12eaa192dddc47d489b624`
`font_02_sfnt_off000118b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x118B0	10196 bytes
SHA-256: `2e1431f0b83d954f67eb0907023deede42c8e4d993407709658fa8a079ec7e9a`

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