PDF malware analysis — malicious · 794b566ab5244455

MALICIOUS

PDF

84.7 KB Created: 2021-09-12 00:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: f6a15b8ad8df4da7de6c43f2c54c9141 SHA-1: 3d9d5778aa378dcd6622564b9ab40b7f9f140064 SHA-256: 794b566ab5244455730df8921a0c613e016b0bf97a73a48aef94e5bafe46acfe

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document that exhibits characteristics of a phishing lure, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the presence of numerous external URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload via the embedded links. No scripts were extracted, but the PDF structure itself facilitates the malicious workflow.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=mobius+final+fantasy+mod+apk PDF link annotation
- http://mascotdd.com/file_media/file_image/file/79636051415.pdfIn PDF document text
- http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16137f5dd486db---togakajezasifavatugumijo.pdfIn PDF document text
- https://rpaxis.net/userfiles/file/nigifa.pdfIn PDF document text
- http://brukikostka.pl/uploads/page/file/37506366966.pdfIn PDF document text
- http://moderncarrent.com/user_img/files/58015816350.pdfIn PDF document text
- https://alley.52886.tw/uploads/files/55748065886.pdfIn PDF document text
- https://profession-your-dr.com/uploads/files/202109061858159617.pdfIn PDF document text
- https://ijp2.com/contents/files/18619589066.pdfIn PDF document text
- http://thebankcardservice.com/uploads/files/papakoraf.pdfIn PDF document text
- http://micdelhi.in/userfiles/file/rapokepirafagekil.pdfIn PDF document text
- https://bnbtravels.com/ckfinder/userfiles/files/wikenotaxalosasiwodu.pdfIn PDF document text
- http://oris-am.com/editor_up/zipabudonipuwidoz.pdfIn PDF document text
- https://pasationtravellers.com/root/FCKeditor/file/puwuvumijuroburu.pdfIn PDF document text
- http://serdceprirody.ru/userfiles/file/gisagogu.pdfIn PDF document text
- https://berbagiangka.com/contents/files/bosaniliru.pdfIn PDF document text
- http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/buzejuxabogujetatuvixexom.pdfIn PDF document text
- http://aligokdemir.com/resimler/files/14903756994.pdfIn PDF document text
- https://havadisname.com/upload/ckfinder/files/potot.pdfIn PDF document text
- https://pet-fashion.ro/mm/file/fobujusexitezowebo.pdfIn PDF document text
- https://yuanfuconstruction.com/ckfinder/upload/files/55807093625.pdfIn PDF document text
- https://niboparis.com/upload/fckeditor/file/1631034932_1.pdfIn PDF document text
- http://infiniti.e-library.tw/uploads/files/vifolipasezeboz.pdfIn PDF document text
- http://webinaris.eu/ckfinder/userfiles/publics/files/gejujonigiwizod.pdfIn PDF document text
- http://gzcaifeilai.com/ckfinder/userfiles/files/202109071747586411.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_off0000e6a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6A9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fec0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFEC0	10868 bytes
SHA-256: `19e81d88be5e9a69599272b1728496d14e78ef067d503a7e66f92e0141391237`
`font_02_sfnt_off000117a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117A6	17556 bytes
SHA-256: `0b4b6198c39e7d8f05ce1ced4cedcf203b71bec384c471b3bc03345ffa9e5dad`

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