PDF malware analysis — malicious · cc3bccc33a95a696

MALICIOUS

PDF

68.3 KB Created: 2021-09-30 23:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 312678a4b1810c2e914c0c87a58c886f SHA-1: 4b6cd492aa33960d92b5e1f4a50b3cfb73f434c5 SHA-256: cc3bccc33a95a6968f10d5e4571827000280dedcaef0702c9547a2973da5aa1a

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and is identified as a phishing lure, likely intended to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of embedded JS and external URIs points to an attack pattern involving user interaction to trigger a malicious redirect.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

Heuristics 7

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE

PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://smidgel.ru/uplcv?utm_term=how+to+facetime+non+iphone+users PDF link annotation
- http://nature-revive.org/files/file/63388191297.pdfIn PDF document text
- https://jnvhardoi.org/ckfinder/userfiles/files/27990707002.pdfIn PDF document text
- https://akemi.ro/hirek/file/54538049117.pdfIn PDF document text
- http://soles2walk.com/data/file/55350383671.pdfIn PDF document text
- https://network-italia.com/file/84209176064.pdfIn PDF document text
- https://silatur.com/js/ckfinder/userfiles/files/bunorezak.pdfIn PDF document text
- https://www.karelo.com/uploads/File/58877012078.pdfIn PDF document text
- http://bordahusfeldolgozo.hu/editor_up/69953222686.pdfIn PDF document text
- http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161504f03d4d3f---86338481832.pdfIn PDF document text
- http://cachnhietwin.com/luutru/files/lusopawosavope.pdfIn PDF document text
- https://e-uchebnici.com/img/file/75069090298.pdfIn PDF document text
- http://www.hon-ro.hu/userfiles/files/suripetufe.pdfIn PDF document text
- https://svenjakretschmer.com/ckfinder/userfiles/files/54261281893.pdfIn PDF document text
- http://aaas.handyfriendship.com/upload/files/74449048338.pdfIn PDF document text
- https://cjsc.se/ckfinder/userfiles/files/41220342007.pdfIn PDF document text
- http://strandedtattoo.info/file/74324148331.pdfIn PDF document text
- http://amsasecretariat.fr/userfiles/file/13767506090.pdfIn PDF document text
- http://teleinwestor.pl/userfiles/file/tuforox.pdfIn PDF document text
- http://vikohasanfiber.com/upload/files/zajusevowen.pdfIn PDF document text
- http://sashtraayurveda.com/ckfinder/userfiles/files/kokibe.pdfIn PDF document text
- http://k2plusinterior.com/userfiles/gudovulamagefexoni.pdfIn PDF document text
- http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142341de1ee4---mijejem.pdfIn PDF document text
- https://zhbiotech.com/CKEdit/upload/files/webumuragizozena.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000afc0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAFC0	14016 bytes
SHA-256: `5c27fd1dead18c6bae1b4aa748098844808fb117134be43faf5af5212adc1e59`
`font_01_sfnt_off0000d282.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD282	10876 bytes
SHA-256: `ea82bd2e73368113be35f41b9da71d01e80b27fd38587d1d858eae8301617ad8`
`font_02_sfnt_off0000eb7c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB7C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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