PDF malware analysis — malicious · c07978a9d87229d8

MALICIOUS

PDF

81.5 KB Created: 2021-05-29 07:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14

MD5: c86c2e751db3f0cdb182a19699b71cc6 SHA-1: 904735d4bc90ac3fa4862f73a52a00aaad1ec1f5 SHA-256: c07978a9d87229d813acaee8075e95d108fcb9266827c5a635f7fc53dfc452d9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic indicating a link farm and an embedded URI pointing to 'resalured.ru'. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support maliciousness. The document body, though heavily obfuscated, suggests a lure related to a book summary, likely intended to trick users into visiting the malicious URL.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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 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.
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://resalured.ru/strik?utm_term=resumen+de+la+pedagogia+del+oprimido+capitulo+1 PDF link annotation
- https://cdn-cms.f-static.net/uploads/4388272/normal_6031b23c2a574.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366015/normal_603f362240565.pdfIn PDF document text
- https://nibowivuxewanu.weebly.com/uploads/1/3/1/3/131379040/sevowa.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4505837/normal_5fe718828bb4c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4478923/normal_60141e314803f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4486206/normal_606e8dfda866d.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4476925/normal_5fdb024bcfaac.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4485810/normal_60095b60b76e6.pdfIn PDF document text
- https://fiwetoki.weebly.com/uploads/1/3/4/2/134235589/nabozitonudupu-komoxuxij-pixene.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4461770/normal_602a494f5bd57.pdfIn PDF document text
- https://wowiwega.weebly.com/uploads/1/3/1/4/131453904/4ded37.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4423195/normal_60167f00b044f.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://uploads.strikinglycdn.com/files/f58b1b49-83a5-4ddd-a808-63a9e359e3a4/samsung_hw-h550_soundbar_wireless_subwoofer.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/6c474bd0-de96-4286-ab9e-581d738a5729/4971483648.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/43d3db45-caef-4029-9396-967c12d3364e/restaurant_operations_manager_hard_rock_cafe_salary.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/1a5f8fe7-6672-44e9-9a1c-902684dc09ea/xurowuvikiregebe.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/bf414e65-71c7-45b6-a669-dec81af94153/muscle_cars_for_sale_craigslist_idaho.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b1dd0895-958c-4c91-a2a9-020fc0929228/new_witcher_book_release_date.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/5532d0aa-1128-406a-a820-0d982a07b5e8/advocare_24_day_challenge_food_guide.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/268bf973-8bfc-4074-8932-4c61c9f19e6c/casio_solar_watch_not_charging.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d257503e-bd3a-4303-b866-668b10fd83cd/89466066643.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b2c7688c-bdea-4267-9c45-b068d0c5f646/67287732390.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_off0000f2ed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2ED	5332 bytes
SHA-256: `e2451acccd34910bbbe037ce4677bc93b690ef9addd56b829f012312c9f8d9e0`
`font_01_sfnt_off000104f9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104F9	10872 bytes
SHA-256: `65347e02f54bfb58817afa886e6320c8c58d0b12a614f60fabc1eba4af48260b`
`font_02_sfnt_off00012826.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12826	4324 bytes
SHA-256: `05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176`

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