PDF malware analysis — malicious · 8fd22d1daf8be8ca

MALICIOUS

PDF

75.3 KB Created: 2021-04-02 16:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: e0d68a1127f996893cc52fca4e53fa68 SHA-1: b294428f6b9d8a77fcb2ae2161fa49e0480cc7b8 SHA-256: 8fd22d1daf8be8cada67e6ce35f9d1f9fa2527b47db72828432189501fe3cc47

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a phishing or link-farming attempt. The PDF structure and embedded content, though heavily obfuscated, indicate an attempt to redirect users to external malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

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://druttle.ru/wix?keyword=enthalpy+change+formula+reactants+minus+products PDF link annotation
- http://requiremcgood.com/how_to_hook_up_landscape_lighting_transformery1hud.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4459477/normal_5fefd39a224eb.pdfIn PDF document text
- http://pekuxareja.22web.org/business_communication_notes_for_bba.pdfIn PDF document text
- http://about-central.com/75313527200lulb7.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4495707/normal_603aea76d79b4.pdfIn PDF document text
- http://ximuvitu.iblogger.org/76737043908.pdfIn PDF document text
- http://batut.space/goxovokikemt6cc.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4382781/normal_6058715a665cd.pdfIn PDF document text
- http://birjand.design/ridax5xjag.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://uploads.strikinglycdn.com/files/f7ef95c0-5ed1-4ac1-8aab-51fc6cf5f17f/the_signal_man_story_summary.pdfIn PDF document text
- https://s3.amazonaws.com/xakapudakadu/zipajo.pdfIn PDF document text
- https://s3.amazonaws.com/gatazeromij/similes_and_metaphors_worksheets_for_6th_grade.pdfIn PDF document text
- http://xomeluwika.rf.gd/restful_web_services_tutorial_java_youtube.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/1b6679f8-00c2-4b57-9226-ecb341eb2c78/why_does_my_water_softener_not_work.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0b4ee395-5989-4444-89a8-70416e7d2dfc/acids_bases_and_salts_chemistry_worksheet.pdfIn PDF document text
- http://nadanopo.rf.gd/42248250918.pdfIn PDF document text
- http://kelawezup.rf.gd/astm_a370_17a_free_download.pdfIn PDF document text
- https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_bf0b00c60c4c419dadb1401b4aa883de.pdf?index=trueIn PDF document text
- https://dce579ed-4708-43c3-aaeb-2c76a6268d78.filesusr.com/ugd/944939_eb6d496553664eafb880e8970b1e71f0.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/tidigudetefumof/jenn_air_ceramic_stove_top_replacement.pdfIn PDF document text
- https://56076a71-1b70-41e8-afe1-d547c394b4ee.filesusr.com/ugd/ab0d05_228009e7b70f4c0e9a492301411d723e.pdf?index=trueIn PDF document text
- https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_8beddd6410284d418115160dfc0e5a57.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_off0000d93e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD93E	5508 bytes
SHA-256: `c6671873a1de8a425962b07fbade7d6aadaf96f94004e0d477209e7489559e18`
`font_01_sfnt_off0000ebd2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBD2	10816 bytes
SHA-256: `9e7cbfaddcfba4911b5c0b51c2ccdbcb0c90ae99b7029e8343a591aaa52a4d65`
`font_02_sfnt_off000110e8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110E8	4324 bytes
SHA-256: `b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c`

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