PDF malware analysis — malicious · dc24a1290c4add24

MALICIOUS

PDF

80.1 KB Created: 2021-04-27 13:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22

MD5: 3ab79e3203b4c27d4a4a169022ce7529 SHA-1: 1f4ab393ab1766a4c3aaa68993d267cd3524c153 SHA-256: dc24a1290c4add2464c7ff5e6bc83a484ba6b07b46b672258aa530b11bf7663f

186 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, indicating a link farm designed to drive traffic. The document body, though heavily obfuscated, suggests a lure related to a 'periodic table worksheet'. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection, strongly suggests malicious intent for traffic generation or further payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

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.
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://druttle.ru/strik?utm_term=periodic+table+worksheet+pdf PDF link annotation
- https://jizotigop.weebly.com/uploads/1/3/0/8/130874082/8411804.pdfIn PDF document text
- https://sejumajofejopib.weebly.com/uploads/1/3/2/7/132740214/nelemoxub.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4480728/normal_603458a8a9a27.pdfIn PDF document text
- https://cdn.sqhk.co/napotani/ghgdQgd/mevuta.pdfIn PDF document text
- https://tapidokebijimub.weebly.com/uploads/1/3/4/5/134577153/puxozujamoxakol.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4484834/normal_5fd1f3a8a4ed9.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4424682/normal_604745101309e.pdfIn PDF document text
- https://kakejomoweva.weebly.com/uploads/1/3/4/6/134674311/c1571ddefd.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4444646/normal_600caa096a6a1.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4421624/normal_5fcc6d5c94df3.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4410004/normal_6045e48d65dfb.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4449397/normal_60593c690d155.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4453129/normal_601b0af71177e.pdfIn PDF document text
- https://jitavemalidev.weebly.com/uploads/1/3/1/8/131871699/sewonuza.pdfIn PDF document text
- https://mewifukemi.weebly.com/uploads/1/3/4/7/134764424/bugasaxi.pdfIn PDF document text
- https://jafobepajimo.weebly.com/uploads/1/3/4/8/134881918/diwobeja-xizaleka-sovevusijad.pdfIn PDF document text
- https://xixezowipena.weebly.com/uploads/1/3/5/3/135341666/09d3250ab8.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4385021/normal_5fe8e954b9693.pdfIn PDF document text
- https://cdn.sqhk.co/numokafas/20vsy9O/woravubokojakidigar.pdfIn PDF document text
- https://cdn.sqhk.co/dudugetogi/bJghJja/70045848041.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
- 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_off0000ef13.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF13	5220 bytes
SHA-256: `0ff483be19e2529cf11ae1cc7776a1a5596ea1f3e4661155566a8104a2dd52ce`
`font_01_sfnt_off000100ed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100ED	10476 bytes
SHA-256: `e2e8b301ea5ad935bcef21f443b5ccd80b2604f82e4d9a8d2c005eb544aecde9`
`font_02_sfnt_off000124d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124D8	4324 bytes
SHA-256: `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`

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