PDF malware analysis — malicious · 7a7e2e4e5c29887c

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 01:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: fbd34e6f268e54b14c0bea4c3467b920 SHA-1: 440ca6849a1bf83c23bd79c506b262cbe244e82b SHA-256: 7a7e2e4e5c29887caf2838c2c3960e3602eaf3ed0e1b489f5889dcec7232df6a

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=dual+boot+windows+10+mac+os PDF link annotation
- https://regaluxiluminacion.com/uploads/assets/file/46708852890.pdfIn PDF document text
- http://giasuthanhdat.vn/Images_upload/files/92220885849.pdfIn PDF document text
- http://prasongp.com/file_media/file_image/file/89061348251.pdfIn PDF document text
- http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/47253757850.pdfIn PDF document text
- https://mbbs.hr/files/79246565362.pdfIn PDF document text
- http://quesnelfoundation.ca/userfiles/file/92707273483.pdfIn PDF document text
- http://sjzhtchem.com/upload/files/85537707511.pdfIn PDF document text
- https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/botofatar.pdfIn PDF document text
- http://suchanekstomatolog.pl/files/file/12053229944.pdfIn PDF document text
- http://adice-area.com/pictures/files/51333346673.pdfIn PDF document text
- http://sangjeom.com/userfiles/file///31093064530.pdfIn PDF document text
- http://knipia.com/userfiles/file/dovuwup.pdfIn PDF document text
- http://dexgerm.com/data/file/userfiles/files/47836432152.pdfIn PDF document text
- https://girisimhaber.com/uploads/file/jipibosotiwiz.pdfIn PDF document text
- http://slesnick.net/userfiles/files/8952902932.pdfIn PDF document text
- http://tecs4.com/intranet/ckfinder/userfiles/files/90679530245.pdfIn PDF document text
- https://drnanemilk.com/tctt/sites/aaa/file/dixazotedefalujumotad.pdfIn PDF document text
- https://tenderdiary.com/ckfinder/userfiles/files/90480507466.pdfIn PDF document text
- http://logiccpacma.com/ckfinder/userfiles/files/33178926374.pdfIn PDF document text
- https://ptogel2.com/contents/files/82334912325.pdfIn PDF document text
- http://emekyesiltepe.net/images_upload/files/63987291802.pdfIn PDF document text
- https://defrokatilai.lt/images/files/vagakiwuwusutujidotegu.pdfIn PDF document text
- http://www.findvoters.com/userfiles/file/85318943466.pdfIn PDF document text
- https://ev-owners.jp/userfiles/files/7622292702.pdfIn PDF document text
- http://aorganboys.handyfriendship.com/upload/files/87815972359.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_off0000e441.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE441	19004 bytes
SHA-256: `cd973e8273cfdfb7e8239ed4dc283183c7f0c77860e80fe31de89a737b5bd678`
`font_01_sfnt_off0001156c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1156C	10800 bytes
SHA-256: `c753ee4424b4ba46108bf4cee7ed0a7e955ea3152102273b98fdead551fcc458`
`font_02_sfnt_off00012e62.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E62	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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