PDF malware analysis — malicious · e4f156fcabe1f9a8

MALICIOUS

PDF

89.1 KB Created: 2021-09-09 06:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: f24304c1c899d9936bcb6843929e0acb SHA-1: 8b574bae94c2d332860f087d04d9704d405cb406 SHA-256: e4f156fcabe1f9a83b8b1f9ee3cdd11d99f4b9ae6b6571c436f211987c2bc7d9

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or credential harvesting lure. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attack pattern involving directing users to potentially harmful external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=siddhartha+hesse+pdf PDF link annotation
- http://lightningriskassessment.com/ci/userfiles/files/tejinodo.pdfIn PDF document text
- https://kaktutzhit.by/uploads/files/kiwirudibebaviwenaku.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613479b2e1d98---91498664105.pdfIn PDF document text
- https://anandamsanyal.com/userfiles/file/46649226830.pdfIn PDF document text
- http://astprom.ru/sites/default/files/file/pebolebufumera.pdfIn PDF document text
- http://archiw.gbpopatowiec.pl/img/upload/files/nulokujibob.pdfIn PDF document text
- https://grupa-energia.pl/attachments/file/62990473835.pdfIn PDF document text
- http://studiotipaldo.com/userfiles/files/7236170932.pdfIn PDF document text
- http://geraldinekilkelly.ie/fedowi.pdfIn PDF document text
- http://china-engine.net/ckfinder/userfiles/files/94748240129.pdfIn PDF document text
- http://kvbm.org/pds/userfiles/files/70260464246.pdfIn PDF document text
- https://gilbertems.com/videos/file/goxagekid.pdfIn PDF document text
- https://www.koreayokogawa.com/ckfinder/userfiles/files/99134960552.pdfIn PDF document text
- http://coimbrasoftware.hu/images/uploads/files/sapamumosevukex.pdfIn PDF document text
- http://scuderieverdina.it/scuderia/userfiles/file/78131489348.pdfIn PDF document text
- http://mastrodibaglio.it/userfiles/files/41529771409.pdfIn PDF document text
- http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/48477885097.pdfIn PDF document text
- https://shiokuda2.com/contents/files/mavujimurotutiranaxup.pdfIn PDF document text
- https://taucaotoccatba.vn/images/news/files/15555760888.pdfIn PDF document text
- https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613130e01951a---wurev.pdfIn PDF document text
- http://acm-medicali.it/userfiles/files/dosafap.pdfIn PDF document text
- https://elperrocallejero.info/ckfinder/files/51089769249.pdfIn PDF document text
- http://jj-metals.com/userfiles/file/2021090422444873499.pdfIn PDF document text
- https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/6972972753.pdfIn PDF document text
- http://scuderieverdina.it/scuderia/userfiles/file/51651024858.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_off0000f20b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF20B	20692 bytes
SHA-256: `b1f42361219808951206859af31f81f5f8d5f626c3c3bf010ed6ab5ffe90bfe4`
`font_01_sfnt_off0001271c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1271C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013f33.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13F33	10400 bytes
SHA-256: `7a6e1306561d1d44d97609d61d3b671199eee617f09b8fb361af3e0547565745`

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