PDF malware analysis — malicious · a8015cd476d8eaff

MALICIOUS

PDF

77.7 KB Created: 2021-04-22 13:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22

MD5: c7cb2a753ba120d3d930ea92de9d90bf SHA-1: 24dd67717ec6ba92730cb632c32fa5e7f74c778e SHA-256: a8015cd476d8eaff2fe0b4445aa175f470061d001cacf4ccff7db853d468b923

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links pointing to a known malicious redirector, yafferge.ru, which is disguised as information about calculators. This strongly suggests a phishing or scam attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of the file. No scripts were extracted, but the presence of malicious URLs is a high-confidence indicator.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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.
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://yafferge.ru/strik?utm_term=ti+83+plus+or+ti+84+plus+calculator In PDF document text
- http://wgathering.org/sunstone_volume_1y7itz.pdfIn PDF document text
- http://e-devletodeme.net/wuzexexelobekgwkky.pdfIn PDF document text
- http://dkmz2.club/24395125193bzbvo.pdfIn PDF document text
- http://filfex.ru/22950538276rxs8v.pdfIn PDF document text
- http://zhk-rekord.info/is_catch_me_if_you_can_on_hbo_maxbq31k.pdfIn PDF document text
- http://it50life.pro/download_drag_sim_2018_mod_apklb98z.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://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_d6824acf2e2e41caa216aab7bc2ce0a5.pdf?index=trueIn PDF document text
- https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_82c1d9e86a8d415dad3a441726707ef6.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/e124ca84-df5d-4540-8003-5da6d9ab9c63/vegan_recipes_easy_meal_prep.pdfIn PDF document text
- https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_9dc601591a8044f18343dc6cf5242f3a.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/viboxikuz/pemin.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/10f02d72-1a90-44d4-b1df-fabfb0bd810f/fifty_shades_of_grey_full_movie_free_download_dual_audio_480p.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f15e265e-70ae-4496-8248-83c13d24f3ac/66282746760.pdfIn PDF document text
- https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_a54c4a05295148b889eb87712336db2a.pdf?index=trueIn PDF document text
- https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_0ed06523975f4064b2bbedea3cbee272.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/najipavez/paschim_express_12926_platform.pdfIn PDF document text
- https://s3.amazonaws.com/juzowilipi/99968888058.pdfIn PDF document text
- https://s3.amazonaws.com/lolijexejomak/91835885887.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/18fc3967-65ce-42b5-a23f-c4f804564fd3/top_10_biggest_cities_in_germany.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e568.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE568	4980 bytes
SHA-256: `32cb4a440aab76ff74f77f6b028d947ed6142f6464da30ddc1e4e1b73a354d10`
`font_01_sfnt_off0000f661.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF661	10804 bytes
SHA-256: `42468fa3b405025e45d1c7a639f5ea55597f7482e4f281b9f5990a813246bf39`
`font_02_sfnt_off00011b52.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B52	4324 bytes
SHA-256: `0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333`

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