PDF malware analysis — malicious · c7857cec07c1accc

MALICIOUS

PDF

80.0 KB Created: 2021-09-22 16:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20

MD5: d235c4451274d9a90fb397533c3ebe4a SHA-1: 0ff391b2d673681a1c31dea0a5a711ee38342813 SHA-256: c7857cec07c1accca6e95c925ebb14831ad1ded97611f43268db9acdc23a8b87

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript, which is a common technique for executing malicious actions within PDFs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF likely serves as a lure to a collection of other documents hosted on various domains, suggesting a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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
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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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 http://china-spec.ru/userfiles/file/81103724991.pdf In PDF document text
- http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614482be68caf---pegirunibujowazapet.pdfIn PDF document text
- http://csc0451.com/userfiles/file/20210904205347_ia5yao.pdfIn PDF document text
- https://tnmkor.com/FileData/ckfinder/files/20210913_A461A19351A0C47D.pdfIn PDF document text
- http://deleersnijder-bocaege.be/images/file/96497230743.pdfIn PDF document text
- http://tokstar.com/_UploadFile/Images/file/jonidapofepitepe.pdfIn PDF document text
- http://finalstage.biz/js/upload/files/15978030959.pdfIn PDF document text
- http://daotaonhaccong.com/uploads/userfiles/file/50061818697.pdfIn PDF document text
- https://bishopsalamatkhokhar.org/userfiles/file/34067288361.pdfIn PDF document text
- http://keletunderground.hu/images/uploaded_pics/file/34481318296.pdfIn PDF document text
- http://gro-felix.si/uploads/luzeteretu.pdfIn PDF document text
- http://bixenony.com/userfiles/files/66742340473.pdfIn PDF document text
- http://satyamtracparts.com/userfiles/file/7653931987.pdfIn PDF document text
- http://koreanhotpot.com/uploads/files/61983018058.pdfIn PDF document text
- http://www.gulbaharsigorta.com/contentData/file/nimabi.pdfIn PDF document text
- https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/af57bcb08d9bb11fb48c75d965cc911f/gegadujexi.pdfIn PDF document text
- https://calendarsunrooms.com/userfiles/files/tukelexus.pdfIn PDF document text
- https://dalilak1.com/userfiles/file/sererafasafuxolojeg.pdfIn PDF document text
- https://hanomanberjaya.com/contents/files/14083706324.pdfIn PDF document text
- http://kiavysocina.cz/UserFiles/File/51543255832.pdfIn PDF document text
- http://ceresasrl.it/userfiles/files/56045960165.pdfIn PDF document text
- http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/jajuwojujuwel.pdfIn PDF document text
- https://orsam.org.tr/paketler/ckfinder/dosyalar/files/lowiwit.pdfIn PDF document text
- http://sanchariglobal.com/userfiles/file/88126019149.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=maybe+this+time+sheet+music+pdfPDF 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_off0000d2c2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD2C2	17944 bytes
SHA-256: `53596b9409fb931b21f4708245abe235f178cbaa1e156875cf6eaaf70850c2ca`
`font_01_sfnt_off0001015a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1015A	10860 bytes
SHA-256: `7fa8ce15d843595d50332e982e79232cff20baf941535380c0f0e9f18456fe24`
`font_02_sfnt_off00011a47.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A47	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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