PDF malware analysis — malicious · 738e4f27d83d969c

MALICIOUS

PDF

88.6 KB Created: 2021-09-20 03:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 19141ef25a588809a0c730eb4755adba SHA-1: 8072111b89198230e9d9808fe8075e044c05ca2e SHA-256: 738e4f27d83d969cc3b8366169ad5dee095e64ede9674c30fc0990bbc8f4335b

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

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 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://medvor.ru/uplcv?utm_term=android+studio+dialogfragment PDF link annotation
- https://corpeverest.com/ckfinder/userfiles/files/katopasewekuwu.pdfIn PDF document text
- http://saipanbooking.com/FileData/ckfinder/files/20210905_9CC28E2421550E30.pdfIn PDF document text
- http://domoticasociale.it/immaginiNewsletter/file/dewejibutowatepipep.pdfIn PDF document text
- https://livresdarts.com/ckfinder/userfiles/files/6580091716.pdfIn PDF document text
- http://www.jysunshine-hotel.com/up_files/file/nomiwamovesix.pdfIn PDF document text
- https://xn--z4qq44i.tw/upload/actfiles/lamiburuxokixoxober.pdfIn PDF document text
- http://metisentry.net/ckfinder/userfiles/files/22064901065.pdfIn PDF document text
- https://aymexco.eu/ckfinder/userfiles/files/77092653416.pdfIn PDF document text
- https://panificioilcavaliere.it/userfiles/files/nozelusulaf.pdfIn PDF document text
- http://shop-cartuning.pl/userfiles/file/89165425319.pdfIn PDF document text
- http://transporteslaplata.com/imagenes_web/file/gomivopitokik.pdfIn PDF document text
- http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ee5a4c4e8---64160977633.pdfIn PDF document text
- https://optimuselearningschool.com/learning/site/images/uploadfiles/tujeloloxarejug.pdfIn PDF document text
- http://oodow.cn/upload/file/210919231506620312rrmig5dlzgv1.pdfIn PDF document text
- https://bhandarisurgical.com/ckfinder/userfiles/files/kodosikikosejob.pdfIn PDF document text
- http://kepco-group.com/uploaded_files/userfiles/files/73996149880.pdfIn PDF document text
- https://beyondpins.com/calisma2/files/uploads/26467035671.pdfIn PDF document text
- https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d1ddc11f4---gabixezironaxa.pdfIn PDF document text
- https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/sunekifakibiduga.pdfIn PDF document text
- https://servauto.fr/img/user/file/wodapix.pdfIn PDF document text
- http://glampingcaravan.com/userfiles/file/20210917061833.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://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_005_off0000e78c.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xE78C	16768 bytes
SHA-256: `fefcec8533fa83157b3d3f31b7f35951d54aeb886fcf93817134b7d8f0fac314`
`font_00_sfnt_off0000c61a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC61A	2068 bytes
SHA-256: `c1a6cbc687586f74c636821a73f6352f65dbbead7a650a693409bc3a91a35709`
`font_01_sfnt_off0000cf7b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF7B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off0000ff79.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF79	24072 bytes
SHA-256: `197bfe3c4aaf71d2cc4948889db2a9fd9deb4601ff2366cdcb2f830f36a34c7b`
`font_04_sfnt_off00013ba8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13BA8	10776 bytes
SHA-256: `99abf657f1df8ba9bf46b8058ff1c7c584037483f00ead902dbd307fa4be2008`

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