PDF malware analysis — malicious · 7c5c4c840be09af2

MALICIOUS

PDF

76.8 KB Created: 2021-06-07 19:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23

MD5: c9edf5535fd0cd1d7856df0c7aabbdd0 SHA-1: 3e3681b3a27b0a898d4d29f3c3ddb08b7863d946 SHA-256: 7c5c4c840be09af2f82f891f0f68e5e2b3e721e8bbd31b55a73d1ac739cf7b64

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The document body, though heavily obfuscated, contains text that appears to be a 'checklist form for classroom', a common lure. The ML classifier strongly indicated maliciousness, and the presence of numerous external URLs points towards a malicious intent, likely to drive traffic to malicious sites or download further payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 5

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://pelibifir.ru/123?utm_term=checklist+form+for+classroom PDF link annotation
- https://static.s123-cdn-static.com/uploads/4422371/normal_5ff0183b16cd3.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4383571/normal_5ff891ee69ea3.pdfIn PDF document text
- https://moremutinujiti.weebly.com/uploads/1/3/4/8/134865562/9921755.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4487186/normal_5fe5ee06273fa.pdfIn PDF document text
- https://fixupusojorulu.weebly.com/uploads/1/3/4/4/134438709/67b2f.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4410013/normal_6004ed793419a.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4372361/normal_606ca0f63c2bc.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4387715/normal_5fe6b66ca21ac.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4391305/normal_605bde2a7823b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4451369/normal_5fd865dc0c2f1.pdfIn PDF document text
- https://vuworuvadile.weebly.com/uploads/1/3/1/6/131637376/526a0d1775.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4383449/normal_6056d1e18cb6e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4404488/normal_6014ac249b743.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4389816/normal_6065c410e9588.pdfIn PDF document text
- https://zodosixuwe.weebly.com/uploads/1/3/4/8/134863902/1ee30e.pdfIn PDF document text
- https://nixoferijoxe.weebly.com/uploads/1/3/4/3/134373865/wipudid.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4454682/normal_5fcf2ea140d88.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4489414/normal_606b247ead178.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/6b90fbb7-79d8-4d9a-b481-3c2b86add7f3/67497791188.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/aadd9074-1944-4a46-9804-0794a20a91b4/73329595421.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_off0000e4cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4CF	4892 bytes
SHA-256: `f6bc2834ad0285f122abea528ffeabb7714e6d9adc487a82a5d55dd9dff5fa4c`
`font_01_sfnt_off0000f567.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF567	10144 bytes
SHA-256: `d7e07ddd91d578920ee83847e01a9f337bcd632acc459c1f567893386d4ab645`
`font_02_sfnt_off0001181a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1181A	4324 bytes
SHA-256: `1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361`

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