PDF malware analysis — malicious · e82b3529ad54f3c7

MALICIOUS

PDF

79.9 KB Created: 2021-09-15 20:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 35fb3d95ed6c46da53eb73fe0c598fcc SHA-1: 9de906dae9a1005b801865c5cee059cf9b69c509 SHA-256: e82b3529ad54f3c70b29114e86bb6117ce7a917fd78ad8b73bef0bb62eceaddc

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is structured as a link farm, suggesting an attempt to trick users into downloading further malicious content. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=wine+arm+apk PDF link annotation
- http://analhospital.net/file/files/baxusarenemiwo.pdfIn PDF document text
- http://chingyi.tw/userfiles/files/65008615614.pdfIn PDF document text
- http://childconnect.com/swi/fckfiles/file/gepofelevixegixom.pdfIn PDF document text
- http://kartywspomnien.pl/uploads/assets/file/95297652795.pdfIn PDF document text
- http://nesemlak.com/test/images/uploads/files/zakotogek.pdfIn PDF document text
- http://sterenstein.ru/userfiles/file/masebilo.pdfIn PDF document text
- https://tamphuctriland.vn/upload/files/15817633609.pdfIn PDF document text
- https://tivicom.vn/upload/files/fufidufademogerejonodaf.pdfIn PDF document text
- https://khotelmarket.com/FileData/ckfinder/files/20210910_7B0C1798C715239E.pdfIn PDF document text
- http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138db5316650---xurezitejuzawimefiw.pdfIn PDF document text
- http://cungcapluonech.com/upload/files/73839699035.pdfIn PDF document text
- http://www.alcera.ca/userfiles/file/15629733082.pdfIn PDF document text
- http://gewald.ru/content/Files/27965879335.pdfIn PDF document text
- https://fobh.net/userfiles/files/zetevivolo.pdfIn PDF document text
- http://tc-antey.ru/uploads/files/37990351130.pdfIn PDF document text
- http://huspanda.com/data/ckfinder/files/91440865915.pdfIn PDF document text
- http://eminenceinc.com/userfiles/file/wixinonuladefax.pdfIn PDF document text
- https://next-engineering.com/userfiles/files/fefitusepanorevaj.pdfIn PDF document text
- http://adance0112.com/upfile/editor/file/xigoxososaxapujefimo.pdfIn PDF document text
- http://kraemer-duennebacke.de/files/file/13786974094.pdfIn PDF document text
- http://szilasfood.hu/pic_upload/files/83302603448.pdfIn PDF document text
- http://muasamhangmy.com/ckfinder/userfiles/files/misafexumenanasose.pdfIn PDF document text
- https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133fcc333a4d---bupazuvovonoza.pdfIn PDF document text
- http://rgn2u.com/userfiles/files/18810803112.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_off0000cf41.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF41	10064 bytes
SHA-256: `312ddc2c78fd452ac890685f6f9aeb12d612f90337fb4ecd2b964c6369387017`
`font_01_sfnt_off0000e591.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE591	20240 bytes
SHA-256: `5b66ca7808b33f0a4c16e8366a87beb261b503bf6925f73acd8b7aee3711ccc0`
`font_02_sfnt_off00011a5f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A5F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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