PDF malware analysis — malicious · 91f55728d7810f77

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 19:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 0257d11a5a1cfabba2b4da72119fa24e SHA-1: 1495d1602f2d476c4fa7d8af9a494899bbce9c7c SHA-256: 91f55728d7810f778d598320a6996668d2998661f87896d19d8b69a2be247ff2

126 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. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to potentially malicious domains. While no scripts were explicitly extracted, the PDF format can embed JavaScript, which could be used to facilitate the redirection to these malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 5

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.
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://powermailer.in/userfiles/file/nurusuva.pdf In PDF document text
- http://hyeminshop.com/DATA/files/38796765576.pdfIn PDF document text
- https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f4e3261bc8954e83fda29d1ffd713bba/49137578963.pdfIn PDF document text
- http://barrospizzadb.com/uploads/files/59879158856.pdfIn PDF document text
- http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/29094850935.pdfIn PDF document text
- https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/kugajaxinu.pdfIn PDF document text
- http://xn--eyt274i.com/upload/files/suwetojose.pdfIn PDF document text
- https://drivetripper.com/userfiles2020/files/26804032749.pdfIn PDF document text
- https://jecoexports.com/ckfinder/userfiles/files/sogom.pdfIn PDF document text
- http://as-eng.biz/userfiles/file/gisamijufajoxado.pdfIn PDF document text
- https://horizontire.com/userfiles/file/zokuwuwi.pdfIn PDF document text
- http://4bx.pl/public/file/sogidez.pdfIn PDF document text
- https://cedria.es/DOCUMENTS/FotosFCKEditor/file/pexubejirumosuzibobin.pdfIn PDF document text
- http://baovekhucongnghiep.com/upload/files/98786310888.pdfIn PDF document text
- https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130aff54315d---18522256473.pdfIn PDF document text
- http://orderkai.com/uploads/files/samikibomogomojokasowul.pdfIn PDF document text
- http://hairtransplantmangalore.com/uploaded_files/userfiles/files/73393296704.pdfIn PDF document text
- http://shengyaweb.com/uploadfile/file/2021091006201399.pdfIn PDF document text
- http://finance-bulldog.cz/UserFiles/File/libisewofuxagemonawogo.pdfIn PDF document text
- https://metnar.pl/web/uploads/files/85363362639.pdfIn PDF document text
- http://e-district.org/userfiles/file/78674041069.pdfIn PDF document text
- http://blueyee.com/upload/file/041204109639.pdfIn PDF document text
- http://machinegroup.ru/img/outer/files/18538771598.pdfIn PDF document text
- http://ih-consultant.com/ckfinder/userfiles/files/39744875192.pdfIn PDF document text
- http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/zonalobowube.pdfIn PDF document text
- http://china-baby-clothes.com/d/files/43802725928.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=can+android+users+facetimePDF link annotation
- 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_off0000d97a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD97A	10724 bytes
SHA-256: `dfe5817237b9f448f7df1923f3a4852b683c94c528fafb1c60ffb38926efd3e1`
`font_01_sfnt_off0000f221.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF221	16956 bytes
SHA-256: `239e3e396b782f344afbfdd8613c260d0a2a1799c6eb8019d4c17173a7736768`
`font_02_sfnt_off00011d42.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D42	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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