PDF malware analysis — malicious · 7a81994a26823c9d

MALICIOUS

PDF

83.7 KB Created: 2021-03-30 23:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23

MD5: 073c7ebd472e79e5f10b5087df05234d SHA-1: 925b90f1688cbfcf0e820be18e5c7a30ae834ef7 SHA-256: 7a81994a26823c9de87ffaf4b47f0ea336ceca607dcf021fb746e02d9d01213e

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://bologen.ru/award?keyword=syllable+rules+in+english+pdf PDF link annotation
- https://cdn-cms.f-static.net/uploads/4473645/normal_6019821382bdb.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4448551/normal_60370e9d0c8b9.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4502464/normal_6055f6693a7f7.pdfIn PDF document text
- http://pink-echo.club/261862194139wenp.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4413567/normal_605f58bf2a2f3.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4495843/normal_5ff095757731c.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4482631/normal_60065b9c56379.pdfIn PDF document text
- http://logvoz.ru/dividing_polynomials_by_monomials_worksheetsfc6u9.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4501993/normal_5fe8744ca8611.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4368493/normal_5ff91b3bea690.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4460982/normal_6002bc3cebc32.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4390374/normal_60525d0736801.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4410027/normal_6012802459e4d.pdfIn PDF document text
- http://zdsshop.top/26273837762w109k.pdfIn PDF document text
- http://snail-case.store/what_is_the_importance_of_recycling_materials7slmp.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4464850/normal_5fdc0c54f3588.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4458625/normal_60632a0f7213b.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://s3.amazonaws.com/zesotat/zuzadojarex.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/64597926-19f0-41c1-acb9-ade0824624bd/dungeons_and_dragons_basic_rules.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/9322b276-b6df-4e82-a449-48e58c7b1cf0/sukixodugajopisudaxuzir.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e110951f-4f57-4eaf-8e07-b8fb29718396/72069268945.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a01da5f1-baed-4195-8a88-e3f0a89d2297/6174014462.pdfIn PDF document text
- https://s3.amazonaws.com/muvazi/tomasefululikevam.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/10605860-9175-4cf6-b949-4296b0823066/pumekazebadekeku.pdfIn PDF document text
- https://s3.amazonaws.com/zisulamisozoto/28304231220.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_off0000fd79.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD79	5340 bytes
SHA-256: `10692c59cb163a2a4c6fe7c75df2588b023a901d1b7298d463220258a90736e9`
`font_01_sfnt_off00010f85.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F85	10620 bytes
SHA-256: `35223f1c3b76ba3a0ac2a44f834d5bd4401d19bf09b58843ce11677d2802cab2`
`font_02_sfnt_off000133dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x133DC	4324 bytes
SHA-256: `7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71`

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