PDF malware analysis — malicious · 911802a5bb2e6f63

MALICIOUS

PDF

79.7 KB Created: 2021-09-21 22:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 1d668ad264e9a1abe7ffc22471589d1b SHA-1: dd116c428d259da0f6b5d5cc2f4f32a674a26e3d SHA-256: 911802a5bb2e6f6348d9ff240fcdd2b0df3b267ab609ef58c2a2e751162a82c2

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. Heuristics indicate it functions as a link farm, directing users to external URLs, one of which is `https://huntic.ru/uplcv?utm_term=download+emulator+ps1+android+terbaru`. The presence of a 'download button' heuristic and the ML classifier's high confidence score suggest a malicious intent to trick users into downloading further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9960

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://huntic.ru/uplcv?utm_term=download+emulator+ps1+android+terbaru PDF link annotation
- http://ecoevopublisher.com/files/upfiles/file/40306659098.pdfIn PDF document text
- http://446888.top/userfiles/file/lofulunoluberujejegilepu.pdfIn PDF document text
- http://budaors.varosom.hu/userfiles/files/55536652042.pdfIn PDF document text
- http://farmaciafici.com/userfiles/files/zefunifobix.pdfIn PDF document text
- http://perilatomsk.ru/ckfinder/userfiles/files/73761986758.pdfIn PDF document text
- https://fengshan-zhennangong.org/upload/ckfinder/files/55426488766.pdfIn PDF document text
- http://www.parinet.fi/tiedostot/files/97433104680.pdfIn PDF document text
- http://erpsamik.com/ckfinder/userfiles/files/47588313592.pdfIn PDF document text
- http://tdbm.vn/upload/files/77448817284.pdfIn PDF document text
- https://villadorottya.hu/uploads/frontend/files/tijixesatakulilefu.pdfIn PDF document text
- https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/86050055459.pdfIn PDF document text
- http://life-worldwide.org/assets/uploads/files/pomaxanawe.pdfIn PDF document text
- https://albertoangel.sinecsas.com/ckfinder/userfiles/files/78572084997.pdfIn PDF document text
- https://billionbosses.com/ckfinder/userfiles/files/soniwufigoliwuni.pdfIn PDF document text
- http://jnejendomsdrift.dk/userfiles/file/xevupomifupodor.pdfIn PDF document text
- https://ntct.dz/ckfinder/userfiles/files/13393145794.pdfIn PDF document text
- http://liveranigioielli.it/userfiles/files/redupifuraroko.pdfIn PDF document text
- http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23200321862.pdfIn PDF document text
- http://buyyoutubecomments.com/ci/userfiles/files/limonesilogen.pdfIn PDF document text
- http://nmways.com/uploads/fckupload/file/93319803907.pdfIn PDF document text
- http://modamoda.nl/uploads/pic_lib/file/68074088181.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a34acf100---bidixuduma.pdfIn PDF document text
- http://bilmatbasim.com/userfiles/file/67537254481.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_off0000d26e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD26E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ea85.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA85	10932 bytes
SHA-256: `7cc75213f9866d25376965d0d7dedf8ceea43989b046a33e645e861c24a7f6e4`
`font_02_sfnt_off000103a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103A8	16924 bytes
SHA-256: `1a81d9117e3bc5b542078ee06f3887628d8c881140d85cbc327a34e63499c805`

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