PDF malware analysis — malicious · fadfcdf13518ae77

MALICIOUS

PDF

79.4 KB Created: 2021-03-21 23:11:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15

MD5: 70f15296f2af072b9a4d14c58af5c84f SHA-1: b03fd807f336e0fdb8fe77dcd9cd8bac2f1212d5 SHA-256: fadfcdf13518ae777bb3d654874a3105e36e053da42a5276334e030fdcd56202

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains multiple external URIs, including one that appears to be a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/123?utm_term=reducing+improper+fractions+worksheet+pdf PDF link annotation
- https://cdn-cms.f-static.net/uploads/4412895/normal_5fd87d28a74aa.pdfIn PDF document text
- http://kumululurug.scienceontheweb.net/9513705661.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366360/normal_60353ea759b09.pdfIn PDF document text
- http://sokepazetovul.22web.org/30108561597.pdfIn PDF document text
- https://siganubamisibu.weebly.com/uploads/1/3/4/1/134108806/wujukove_wilavagoraluzu_dopewukonep.pdfIn PDF document text
- http://jupumatoza.iblogger.org/detective_chinatown_2_full_movie_free.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4374685/normal_603c79e555ad4.pdfIn PDF document text
- http://muvajopumo.22web.org/what_not_to_eat_on_a_dairy_free_diet.pdfIn PDF document text
- http://tupuwuwegidava.22web.org/gekugibilupemoxoka.pdfIn PDF document text
- https://dedolodaramolon.weebly.com/uploads/1/3/1/4/131455072/395467f7604f.pdfIn PDF document text
- https://dapunilak.weebly.com/uploads/1/3/4/5/134506399/a769ed1f964092.pdfIn PDF document text
- http://rerikadarax.iblogger.org/87937981185.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://fupewazogapoda.rf.gd/55690600948.pdfIn PDF document text
- http://xiwexuxe.atwebpages.com/lukobejerurilugojugele.pdfIn PDF document text
- http://nuvebuxuloruvux.epizy.com/medical_terminology_textbook.pdfIn PDF document text
- https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_314ab22399844beb8814eb01de0a0bed.pdf?index=trueIn PDF document text
- https://2a26c5f8-c4f8-4af8-830b-7e2c9961bd8e.filesusr.com/ugd/2e4362_cadca945478641cda51c1d986d58ddb2.pdf?index=trueIn PDF document text
- http://xukenefurirog.epizy.com/how_to_check_number_of_day_trades_on_td_ameritrade_app.pdfIn PDF document text
- https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_74de1c8f8f784ff18885a25a180fa098.pdf?index=trueIn PDF document text
- http://fuvusujalujule.epizy.com/sherlock_holmes_season_3_subtitles_free.pdfIn PDF document text
- https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_3842ec7235b6490c8c4ef6b6615066a0.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
- 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_off0000dfcb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFCB	5700 bytes
SHA-256: `83554e40f353aea79408115660178cc8e1b7c8a967a2399379f0c0cbc599af1f`
`font_01_sfnt_off0000f32c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF32C	10988 bytes
SHA-256: `2b0ef1d32e49f0ebc959fc8e73321593cfb8d4ecc5abf5dc73a36bf9eb1c4ea9`
`font_02_sfnt_off000118ff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x118FF	16204 bytes
SHA-256: `a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd`

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