PDF malware analysis — malicious · c42f04cba5fd91a5

MALICIOUS

PDF

82.8 KB Created: 2021-05-12 04:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23

MD5: b53e126e02981e236c728bc4aafaa762 SHA-1: 9794fef7d0bc227a306eee898a49b5f0677bcafb SHA-256: c42f04cba5fd91a57d14c26fc9fa8ab582d2b1f644e011c5e13ebba50f04b81b

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9996

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://nipisod.ru/strik?utm_term=covid+19+work+policy+pay PDF link annotation
- https://cdn-cms.f-static.net/uploads/4406223/normal_606a83907193a.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4391909/normal_5fe7dea2e367e.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4444113/normal_6005230b3b630.pdfIn PDF document text
- https://kotedeturu.weebly.com/uploads/1/3/1/6/131606402/vutejik_zutedimir_kalet.pdfIn PDF document text
- https://cdn.sqhk.co/fipimomozuk/fhfgjgh/51767841768.pdfIn PDF document text
- https://cdn.sqhk.co/nuduniguwufo/tnojeia/vebobakusafaji.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4489853/normal_6010950137de6.pdfIn PDF document text
- https://cdn.sqhk.co/budajawisore/jijcphj/26498663549.pdfIn PDF document text
- https://sukowuxipimo.weebly.com/uploads/1/3/4/3/134318810/1190727e9f3ee9d.pdfIn PDF document text
- https://cdn.sqhk.co/pijavagoke/Oha1gjj/ruzatukubavavukejogiruwap.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4409113/normal_6014ff18816f0.pdfIn PDF document text
- https://cdn.sqhk.co/sosexazefip/aFDgege/pujadokadarurowepofug.pdfIn PDF document text
- https://cdn.sqhk.co/zijigemeworu/NFQvjbe/savings_goals_app_ios.pdfIn PDF document text
- https://vugiwaxe.weebly.com/uploads/1/3/4/7/134739196/fixibesijunuzezuna.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4469630/normal_5fd92f5c266bc.pdfIn PDF document text
- https://nofuzibid.weebly.com/uploads/1/3/1/4/131453406/tunukoripijop.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/popisiburewixuj/browserling_whatsapp_jio_phone_free.pdfIn PDF document text
- https://s3.amazonaws.com/paxuvagal/cavaleiros_do_zodiaco_omega_legendado.pdfIn PDF document text
- https://s3.amazonaws.com/miledu/android_google_play_store_apk.pdfIn PDF document text
- https://s3.amazonaws.com/vonutavekip/20585114073.pdfIn PDF document text
- https://s3.amazonaws.com/jivala/55083316182.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
- 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_off0000f183.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF183	5320 bytes
SHA-256: `5b107d12757046c30e5bf80904a668a784f3131a7636a478c36bf89109c70c88`
`font_01_sfnt_off000103cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103CD	10804 bytes
SHA-256: `ce5b2817178c5f3bc1b698f041efdc1cd7c490d6ca5cc99124644569d03601d5`
`font_02_sfnt_off000128f9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128F9	16060 bytes
SHA-256: `5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330`

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