PDF malware analysis — malicious · 4f710e0ca4d47701

MALICIOUS

PDF

75.4 KB Created: 2021-02-08 11:00:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17

MD5: c0774db07a1fe48b0f9d19fa43e7e54d SHA-1: 2235e1d4ab7f458ffcc400caa72569781782ae9a SHA-256: 4f710e0ca4d4770137fd6f8e2d191843bd142e90175a44cd6ec6c66d9e086465

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, with one heuristic specifically flagging it as a 'PDF_SEO_LINK_FARM' containing 30 external PDF links. The primary external URI points to 'https://leonvi.ru/123?utm_term=huntsville+municipal+court+records', suggesting a potential phishing lure related to court records. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
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://leonvi.ru/123?utm_term=huntsville+municipal+court+records PDF link annotation
- https://cdn-cms.f-static.net/uploads/4419211/normal_6015b869e366a.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4461207/normal_5fe34a2fecb83.pdfIn PDF document text
- https://metenesepagozo.weebly.com/uploads/1/3/4/7/134710396/konununamaliw.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4366965/normal_5fde840be29c0.pdfIn PDF document text
- https://figapizezedop.weebly.com/uploads/1/3/4/3/134364787/gawanogemavegez.pdfIn PDF document text
- https://kelonefak.weebly.com/uploads/1/3/2/6/132683111/5903872.pdfIn PDF document text
- https://pifaxatopegamu.weebly.com/uploads/1/3/4/1/134108845/8d0a5.pdfIn PDF document text
- https://mupililoxer.weebly.com/uploads/1/3/5/3/135302313/vofizoku.pdfIn PDF document text
- https://ledimame.weebly.com/uploads/1/3/5/3/135306483/f8972f0e6114.pdfIn PDF document text
- https://bumovewadenol.weebly.com/uploads/1/3/5/3/135318567/4702097.pdfIn PDF document text
- https://jekufagiz.weebly.com/uploads/1/3/0/7/130739150/zitigiruwinaniwa.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4408170/normal_5feb0fb4ed3b3.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/xufoxorog/nofikavenekotabopateju.pdfIn PDF document text
- https://s3.amazonaws.com/zaxawetawupo/kawaii_home_design_mod_apk.pdfIn PDF document text
- https://s3.amazonaws.com/latufenaw/kuralidukopunud.pdfIn PDF document text
- https://s3.amazonaws.com/tuxexi/californication_all_episodes.pdfIn PDF document text
- https://s3.amazonaws.com/xujitezu/baal_veer_episode_880_3gp.pdfIn PDF document text
- https://s3.amazonaws.com/lotibabakuj/raju_bhai_whatsapp_status.pdfIn PDF document text
- https://s3.amazonaws.com/perurulexi/93812817674.pdfIn PDF document text
- https://s3.amazonaws.com/dogazisuze/crystal_reports_redistributable_crredist._msi_x86.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ea8f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA8F	5240 bytes
SHA-256: `854a3447e35258a867a8dbd582934e9b24a37a3289a57999791eaa3f8975f81d`
`font_01_sfnt_off0000fc4c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC4C	10428 bytes
SHA-256: `ded264543c1e1460c0f655829de7969d3aecbce44a021bf918825ed7a621e17e`

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