PDF malware analysis — malicious · 99355ad2fef3ed47

MALICIOUS

PDF

71.8 KB Created: 2021-03-30 11:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18

MD5: e8d5916ba38e715cd4ba6dc552be1648 SHA-1: 9e57bd09f2f7e687310cbbb418b73637309dc6fa SHA-256: 99355ad2fef3ed47890ac17bc04a10630485a2f788b3bf66ce4dd1132bdf29fe

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, suggesting a phishing or redirection scheme. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, pointing towards an attempt to lure users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

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 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://golowaki.ru/123?utm_term=arjun+kanungo+fursat+video+song PDF link annotation
- https://gatuniku.weebly.com/uploads/1/3/4/0/134097356/mewanulewafawivo.pdfIn PDF document text
- https://fetuzulozolu.weebly.com/uploads/1/3/0/7/130775138/8713172.pdfIn PDF document text
- https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/6101025.pdfIn PDF document text
- https://sazejorewisiboj.weebly.com/uploads/1/3/4/4/134459615/833455.pdfIn PDF document text
- https://cdn.sqhk.co/sulubejes/ahdhhhd/fupujapizo.pdfIn PDF document text
- https://cdn.sqhk.co/pakebisas/3byhixP/steven_universe_amino_apkpure.pdfIn PDF document text
- https://wikefazopikevi.weebly.com/uploads/1/3/4/7/134715570/1e86bc1.pdfIn PDF document text
- https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/3706693.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://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_aefe362be92049c9a37990afca5c4790.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/89d1ed2f-fb0d-4fb1-ba18-a842519e8223/software_development_engineer_amazon_web_services_salary_us.pdfIn PDF document text
- https://9f7573d5-7b83-49a5-9b97-b0679d2fa1e3.filesusr.com/ugd/891219_cab9badabbfe4eb2848e3e3378b7a2c5.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/b9cf1065-6791-489a-a543-406e979cfa17/how_to_put_games_on_ti_89_titanium_calculator.pdfIn PDF document text
- https://e0529b0e-ffd4-46ae-8a9e-348c3aa8e3ae.filesusr.com/ugd/27320f_77f804f83c214dbca1a1a9772c7003b2.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/dowavelaxam/best_star_wars_canon_books_2019.pdfIn PDF document text
- https://s3.amazonaws.com/pibajuwi/firetuvafituto.pdfIn PDF document text
- https://s3.amazonaws.com/tazibabebamep/11136099510.pdfIn PDF document text
- https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_8b127feada4748cc92de834d0264a3a0.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_off0000cd4b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD4B	5116 bytes
SHA-256: `4145c244c17482a9bd7ee225602c68c3bf4f85b5075b4e25143fbd2a2a5cc40f`
`font_01_sfnt_off0000deca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDECA	10932 bytes
SHA-256: `1663b1e4df7d096f814e59e275379f4bfb7700d05e3649ced8fbb28c43451e9d`
`font_02_sfnt_off00010417.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10417	4324 bytes
SHA-256: `cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34`

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