PDF malware analysis — malicious · 071c299d29b74aa1

MALICIOUS

PDF

81.2 KB Created: 2021-06-08 00:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13

MD5: ac50c391a6766a7123544780ad19e806 SHA-1: afef03dcc76abcc997c6e9ee517405d7f758bf22 SHA-256: 071c299d29b74aa1def52a2e041516e40468aec9a37588406c29c79bee05f114

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection scheme. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics indicate a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text related to 'decimal word problems grade 5 with answers', which is likely a lure to disguise the malicious nature of the embedded links.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/123?utm_term=decimal+word+problems+grade+5+with+answers PDF link annotation
- https://lomizagufefeg.weebly.com/uploads/1/3/4/0/134096038/6959f.pdfIn PDF document text
- https://static.s123-cdn-static-d.com/uploads/4365638/normal_60b04b15cc219.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4368751/normal_5fcdd0bb90ff7.pdfIn PDF document text
- https://vebavorosufate.weebly.com/uploads/1/3/4/7/134742301/4993263.pdfIn PDF document text
- https://rarogifiteli.weebly.com/uploads/1/3/4/5/134529860/8036222.pdfIn PDF document text
- https://fitadidexedas.weebly.com/uploads/1/3/5/9/135977916/fivixenumogubozujax.pdfIn PDF document text
- https://makukojubava.weebly.com/uploads/1/3/0/7/130739489/8159683.pdfIn PDF document text
- https://nawawedivoxoni.weebly.com/uploads/1/3/4/7/134719505/datexekekizeg.pdfIn PDF document text
- https://ximesadi.weebly.com/uploads/1/3/0/9/130969353/2810690.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://tejudafo.pbworks.com/w/file/fetch/144819336/55962776482.pdfIn PDF document text
- http://junerew.pbworks.com/f/how_to_make_a_double_knot_necklace.pdfIn PDF document text
- http://dobifapig.pbworks.com/f/74141721005.pdfIn PDF document text
- http://vidijowa.pbworks.com/w/file/fetch/144815655/nufusobovapuf.pdfIn PDF document text
- http://pakesobiroge.pbworks.com/f/21068629428.pdfIn PDF document text
- http://gutogupaxaz.pbworks.com/f/sebesalegodunu.pdfIn PDF document text
- http://zajozote.pbworks.com/f/nupemixoziwazegatos.pdfIn PDF document text
- http://sapagujedok.pbworks.com/w/file/fetch/144600507/circuit_diagram_of_semi_automatic_washing_machine.pdfIn PDF document text
- http://giwupiraride.pbworks.com/w/file/fetch/144569325/devekegulitelolovezevon.pdfIn PDF document text
- http://bibosopimugo.pbworks.com/w/file/fetch/144622518/kalasesudiwikada.pdfIn PDF document text
- http://wojipag.pbworks.com/f/79094358262.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_off0000ee65.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE65	5628 bytes
SHA-256: `dba0d78e635a11e19c506ec1e3fb352b24bb589838a940cab8671dd5ef28a4d8`
`font_01_sfnt_off0001016a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1016A	11108 bytes
SHA-256: `91b993111eb527906705a1b1b1b27e44f63b6b2f780eb2e013d29786a1b7fdd9`
`font_02_sfnt_off0001276b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1276B	4324 bytes
SHA-256: `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`

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