PDF malware analysis — malicious · f78d125e1e2b9380

MALICIOUS

PDF

69.0 KB Created: 2021-09-29 06:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 53a12f81aa298505eceec1528ebc4bd1 SHA-1: dbef4b1a12de8d7385ee506c0b36f365d41e192a SHA-256: f78d125e1e2b938062ef0a2cf84410d9aa8728b42ff37f66aa3f6cec7f68ffc7

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure itself is also flagged for containing a link farm, reinforcing the malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 5

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.
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://infrive.ru/uplcv?utm_term=top+blogs+2020 PDF link annotation
- https://hoya.hr/UserFiles/file/83615979108.pdfIn PDF document text
- https://gabconstruction.com/ckfinder/userfiles/files/25722989831.pdfIn PDF document text
- https://www.iieng.org/editor/ckfinder/userfiles/files/54989781099.pdfIn PDF document text
- http://crystal-lamp.ru/uploads/files/49226700068.pdfIn PDF document text
- http://luijkzonwering.nl/image/file/1359886065.pdfIn PDF document text
- http://facilitymanagementassociates.com/survey/userfiles/files/temuluremabiwusazuf.pdfIn PDF document text
- http://sergeisurzhin.ru/ckfinder/userfiles/files/zejavawewalirut.pdfIn PDF document text
- https://e-motorcycle.tw/upload/emotorcycle/files/79235051128.pdfIn PDF document text
- http://hai-bi.com/uploads/files/202109031044486156.pdfIn PDF document text
- http://trieuduong.com/images/Download/11776450555.pdfIn PDF document text
- https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a47f8a4305---98484333208.pdfIn PDF document text
- http://amongelite.com/ci/userfiles/files/66895514776.pdfIn PDF document text
- http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/dapivepejajejubokovupe.pdfIn PDF document text
- https://adurucui.com/ckfinder/files/fuvumivonode.pdfIn PDF document text
- https://phr4u.com/files/vulipigutedafunabutital.pdfIn PDF document text
- http://miyagi.chi-kara.net/Upload/files/zitonenafukubiji.pdfIn PDF document text
- http://trungnguyenjsc.vn/uploads/image/files/82499938323.pdfIn PDF document text
- http://maksimetall.ru/files/tavabenazan.pdfIn PDF document text
- https://xn--fct5g39pjpo.tw/upload/leakstop/files/pizojakoxuwakari.pdfIn PDF document text
- http://hondatayho.vn/images/ckeditor/files/dokexotojenididopoxik.pdfIn PDF document text
- https://strefaokazji.pl/uploaded/file/petori.pdfIn PDF document text
- https://poulinstrapscan.com/userfiles/file/8996710716.pdfIn PDF document text
- https://history.tlshaa.org.tw/ckfinder/userfiles/files/79038589579.pdfIn PDF document text
- http://pytextiles.com/userfiles/file/teronesevit.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_off0000b2b1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB2B1	10084 bytes
SHA-256: `30077304932ad652eea0870a065ca4c85484cf4845b779a9b9476968485dff36`
`font_01_sfnt_off0000c900.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC900	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e112.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE112	14928 bytes
SHA-256: `61588c8b66807107c9e1e54b7da6e607a09659db08dc964668c0ce5b760d2cf2`

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