PDF malware analysis — malicious · 75b725311aedb2e8

MALICIOUS

PDF

79.9 KB Created: 2021-09-15 21:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 782b46fb65d5006cfbea3ae744043bb6 SHA-1: f317baefdb6f0198188d3c6fdd5ac191a9cdc9ef SHA-256: 75b725311aedb2e8c59db01c890d8a15f9fa4cd5cda66c335421a31b0e5871ff

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary intent appears to be phishing or malware distribution through these external links.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 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://coretry.ru/uplcv?utm_term=100+day+zombie+survival+mod+apk PDF link annotation
- http://newcityhk.com/userfiles/33500223869.pdfIn PDF document text
- http://czernavendeghaz.hu/admin1/file/felanavodaxanonugoforure.pdfIn PDF document text
- http://esejsc.com/upload/files/52491400465.pdfIn PDF document text
- http://hidramaco.com/files/files/verazirisupupa.pdfIn PDF document text
- http://acelybio.com/upload/files/xifuwanabibu.pdfIn PDF document text
- http://heryeryesil.com/resimlerfiles/retuparulexasolinizafi.pdfIn PDF document text
- http://veterinariomauracotti.it/userfiles/files/50205381136.pdfIn PDF document text
- http://jun-travel.com/userfiles/file/lawanib.pdfIn PDF document text
- http://haokunchem.cn/upload/files/53005497296.pdfIn PDF document text
- https://kompaspt1.com/contents/files/22574695362.pdfIn PDF document text
- https://cbconsulting112.ca/userfiles/files/xototirupavitimi.pdfIn PDF document text
- https://hantverkarenisandby.se/UserFiles/files/bojab.pdfIn PDF document text
- https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f225ab9803---zulowadamewabi.pdfIn PDF document text
- http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613621aa7be3a---22990086597.pdfIn PDF document text
- http://szzxwx.com/Upload/Upload/file/2021981420461072.pdfIn PDF document text
- http://robalton.es/Albums/images/file///rupapidutalap.pdfIn PDF document text
- http://tbeaindia.com/userfiles/file/51839860683.pdfIn PDF document text
- http://tanriovermensucat.com/uploads/genel/files/16832720472.pdfIn PDF document text
- https://rh4-h1tapi-turbo.com/contents/files/mazekezesu.pdfIn PDF document text
- https://olboihorgaszto.hu/editor_up2/14596769423.pdfIn PDF document text
- http://tomboy2.com/images/library/File/wudijiriganodubenoz.pdfIn PDF document text
- http://hourinkan.net/js/upload/files/29539952254.pdfIn PDF document text
- http://rem-proekt.com/f/file/kerofifozokakelizikixig.pdfIn PDF document text
- http://ahrestygz.com/userfiles/files/20210901_101110.pdfIn PDF document text
- http://vonschickenfremont.com/uploads/files/2772287408.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_off0000c5f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC5F0	11000 bytes
SHA-256: `357e2fd8b0f2b05e439f81d601daa3000902491593e58467d713d228e4523168`
`font_01_sfnt_off0000df55.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF55	22732 bytes
SHA-256: `b729dee45ea5b14f13237374543de97c2f60f9575f22ad48196996a4bea1e560`
`font_02_sfnt_off00011986.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11986	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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