PDF malware analysis — malicious · ef3acdc98cf9a8a0

MALICIOUS

PDF

65.9 KB Created: 2021-01-20 14:33:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15

MD5: f943ffcda1f2eecc06c34e4d1f6a94bf SHA-1: 028874d07d0da110dc12501a4c2d00b27d23a4a7 SHA-256: ef3acdc98cf9a8a03fecc520cdd16ffeffd4060356bbc32feaf245b7b952a4dd

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. An external URI pointing to 'maypoin.ru' was extracted, which is likely the malicious destination. The document body, though heavily obfuscated, contains text related to 'worksheet answers', suggesting a lure to trick the user into visiting the malicious URL.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 4

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://maypoin.ru/123?utm_term=physical+and+chemical+properties+worksheet+answers PDF link annotation
- https://lidovoji.weebly.com/uploads/1/3/4/3/134313359/8476583.pdfIn PDF document text
- https://safamitiwifiro.weebly.com/uploads/1/3/0/7/130739579/noteri.pdfIn PDF document text
- https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/fitobosu.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4409417/normal_5fe235462e606.pdfIn PDF document text
- https://gisogademumes.weebly.com/uploads/1/3/1/3/131379615/jamowiremekewisol.pdfIn PDF document text
- https://jizotigop.weebly.com/uploads/1/3/0/8/130874082/jopadimekudonagar.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4487906/normal_5ffb86edd3669.pdfIn PDF document text
- https://jorevubo.weebly.com/uploads/1/3/4/8/134869484/5115916.pdfIn PDF document text
- https://janososa.weebly.com/uploads/1/3/5/3/135326085/xetanapizikuz.pdfIn PDF document text
- https://vetitigozep.weebly.com/uploads/1/3/1/4/131437709/nopur-luguvegidufapa-mufojikup.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/suxuzubojut/patomekanisme_oliguria.pdfIn PDF document text
- https://s3.amazonaws.com/feliso/mapa_cabarceno_2019.pdfIn PDF document text
- https://s3.amazonaws.com/busutafitufe/98104485040.pdfIn PDF document text
- https://s3.amazonaws.com/boduxatavepe/ruxajoworesoxinumet.pdfIn PDF document text
- https://s3.amazonaws.com/xojafemori/happy_hour_invite_free_template.pdfIn PDF document text
- https://s3.amazonaws.com/fobupojowojon/64251691416.pdfIn PDF document text
- https://s3.amazonaws.com/tetenifeme/2419024847.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c387.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC387	5572 bytes
SHA-256: `d5da0d56c6a7dc0c7acb36217cb68309980155c979b173bebef3f0482d0212e8`
`font_01_sfnt_off0000d666.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD666	10188 bytes
SHA-256: `5ccebcb273beb548b6983bf3b011f65bf78bd900244cf160704d3631bd41cab5`

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