PDF malware analysis — malicious · 6711552c2bf156a4

MALICIOUS

PDF

87.2 KB Created: 2021-03-23 06:58:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02

MD5: 7b3ebbfca246291206cb232ac12b5456 SHA-1: 326ab2425973c2d13dbc9c5b74fb1e69f878bc18 SHA-256: 6711552c2bf156a4f2a2168893dd7b7fc9ac0b695b703aadd8758372bf7e408c

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by both ML classification and ClamAV, specifically as a phishing trojan. It contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam tactic. The embedded document body text is largely unreadable, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic indicate the primary function is to redirect users to potentially malicious or phishing websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 6

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.
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://midufefew.ru/award?keyword=ahu+and+fcu+pdf PDF link annotation
- https://noremovex.weebly.com/uploads/1/3/4/8/134883944/cca169ee.pdfIn PDF document text
- https://gitazedekof.weebly.com/uploads/1/3/1/3/131398323/vejuzopotisefik.pdfIn PDF document text
- https://xodukibefapox.weebly.com/uploads/1/3/0/8/130873769/e10b318426261.pdfIn PDF document text
- https://dapofawebowo.weebly.com/uploads/1/3/5/3/135347186/7f5707821.pdfIn PDF document text
- https://lugumeduzox.weebly.com/uploads/1/3/0/7/130740149/pilifidagemavi.pdfIn PDF document text
- https://rezapikuxodet.weebly.com/uploads/1/3/0/9/130969426/57d3d5ce.pdfIn PDF document text
- https://lesivemiseleji.weebly.com/uploads/1/3/1/3/131381961/pabelepuvaxusudaliwu.pdfIn PDF document text
- https://daguvosiliwu.weebly.com/uploads/1/3/1/4/131406153/lamagifepo_jomor.pdfIn PDF document text
- http://tujofuzenej.iblogger.org/hortonworks_installation_guide.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_bba0188882a049fabc960045cf86ffde.pdf?index=trueIn PDF document text
- http://mimogovudefo.rf.gd/sodewufizonigakef.pdfIn PDF document text
- http://dubexejevobogi.rf.gd/xomip.pdfIn PDF document text
- https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_5e9bfd51211a478b81c70a1f9c0db048.pdf?index=trueIn PDF document text
- http://wulagaw.rf.gd/sociological_imagination_essay.pdfIn PDF document text
- https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_88bfc352ae43421597ddd83eb936b483.pdf?index=trueIn PDF document text
- http://jakefubenuwep.epizy.com/definition_of_sustainability.pdfIn PDF document text
- https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_dd9368d959564da6825d67e5db97adcd.pdf?index=trueIn PDF document text
- http://lavodusepigixu.rf.gd/cambridge_pet_speaking_exam.pdfIn PDF document text
- https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_96d5d78e93d046fdb5dfd1fd9c4b343f.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00010c83.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C83	4452 bytes
SHA-256: `26aba7e3e34bb5c5b3c8f094a23a2c8934cf6befe9f38009243eb5dbcdfd01a0`
`font_01_sfnt_off00011b82.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B82	11036 bytes
SHA-256: `9bc9816da719a2682cc8012ffb73a4d354db6569067ae0a1673fffc72493b0f6`
`font_02_sfnt_off0001413d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1413D	4324 bytes
SHA-256: `cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34`

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