PDF malware analysis — malicious · e7c6efdcc2b27480

MALICIOUS

PDF

83.2 KB Created: 2021-09-24 10:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: c522bcc2f6724f1e77f0c034c230c579 SHA-1: 654b29ece22915f1485c804c0da157b3d502fd89 SHA-256: e7c6efdcc2b27480080396d8f10acbca01b7eb86fc9e41807a8c83d4c00929fc

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and ML classifiers, and exhibits characteristics of a link farm on disposable hosting. Multiple PDF links point to external URLs, with one specifically identified as a link to a PDF file hosted on 'superiorservicesandsolutionsfl.com'. This suggests the document's primary purpose is to redirect users to malicious content, likely for phishing or malware distribution.

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
PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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.
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://smidgel.ru/uplcv?utm_term=live+lock+screen+iphone+11 PDF link annotation
- http://lifebeachvilla.com/uploads/image/files/45055722650.pdfIn PDF document text
- https://ku4ysk-9lgp4y.com/contents/files/34320112966.pdfIn PDF document text
- http://www.terresdescaraibes.fr/file/75113631008.pdfIn PDF document text
- http://abyss.sk/userfiles/file/76324252630.pdfIn PDF document text
- http://comitatoamiantovelodromo.org/userfiles/file/42092179117.pdfIn PDF document text
- https://atlantidegattico.it/file/60538983980.pdfIn PDF document text
- https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/40187061664.pdfIn PDF document text
- http://sanjarbek.uz/userfiles/file/87981171037.pdfIn PDF document text
- http://tranhdaquydep.vn/upload/files/40919291590.pdfIn PDF document text
- http://hanyangsteel.com/files/fckeditor/file/158515051261393d8e1b59a.pdfIn PDF document text
- https://quangcaowebsite.vn/uploads/files/niluxibadowuvobosuxigo.pdfIn PDF document text
- http://myphamnanyno.com/luutru/files/zajifapo.pdfIn PDF document text
- http://studiozoppini.com/userfiles/files/84210661012.pdfIn PDF document text
- https://lawyerupsmart.com/tempimg/file/55800703593.pdfIn PDF document text
- http://oa30us.com/userfiles/file/vebesosakovonaf.pdfIn PDF document text
- https://nulifeus.com/~nulife/userfiles/file/patewobifeta.pdfIn PDF document text
- https://sunnyvale.com/wysiwygfiles/file/waziduwuzovobibad.pdfIn PDF document text
- http://tomasmrazek.cz/userfiles/file/26229405228.pdfIn PDF document text
- https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/ruratika.pdfIn PDF document text
- https://iqrainternationalschool.org/_assets/files/nuzozuzadobofanitorubuza.pdfIn PDF document text
- http://ackerviewguesthouse.com/userfiles/file/14276817920.pdfIn PDF document text
- http://otohondamientay.com/upload/files/luwomezitifutawamoju.pdfIn PDF document text
- http://limeitec.com/upfiles/editor/files/niwubipopelasofupagul.pdfIn PDF document text
- http://laserinnsbruck.com/static/bovubaletikikepov.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_off0000e0ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0EF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f906.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF906	10380 bytes
SHA-256: `4badb1474aad06234cb53ff847b83bd3e569c90d6076b48ca55ab3d1bd9275ca`
`font_02_sfnt_off0001106f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1106F	18208 bytes
SHA-256: `d53a40abdd37c659c1b56c68a866862ebb9174ca1870e85997c7832fb30a054b`

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