PDF malware analysis — malicious · c6964574138a6c91

MALICIOUS

PDF

72.3 KB Created: 2021-09-15 19:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 6360deaeb9c3c7cddb631e8aa8c31c93 SHA-1: 61aaa1c3ea05c3696026660e1e6c64280d89a574 SHA-256: c6964574138a6c9176f6db8f9fbe9f5184adb6a1ea9e872e2371511979dd0f55

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with several pointing to domains that appear to be part of a link farm, suggesting a redirection mechanism. The presence of a disposable link farm heuristic further supports this, indicating the PDF's primary purpose is to funnel users to external, potentially malicious, content.

Machine Learning

Nyx PDF Classifier malicious score 0.9981

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 http://czernavendeghaz.hu/admin1/file/jawoler.pdf In PDF document text
- https://inprovitperu.com/ckfinder/userfiles/files/58965814777.pdfIn PDF document text
- http://moscow-vernisage.com/files/files/58017421941.pdfIn PDF document text
- https://geya99.com/ckfinder/userfiles/files/muvuzinagikifebura.pdfIn PDF document text
- http://mannaz.pl/userfiles1/file/56012551263.pdfIn PDF document text
- https://durgabas.coop.np/ckfinder/userfiles/files/lisux.pdfIn PDF document text
- https://volgogradexpo.ru/ckfinder/userfiles/files/6966097022.pdfIn PDF document text
- http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbbc796a2e---45135305934.pdfIn PDF document text
- https://tsydesign.com/userfiles/jws/files/3216872979.pdfIn PDF document text
- http://hawaiianhunareiki.it/file/vofasowawedowe.pdfIn PDF document text
- http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e864d368cf---libojapodalarogezawiruxo.pdfIn PDF document text
- http://cheumst.com/upload/fckeditor/file/90754188244.pdfIn PDF document text
- http://pogologistics.com/ckfinder/userfiles/files/4618266185.pdfIn PDF document text
- http://alpanelektrik.com/depo/sayfaresim/file/nisagowanobixabewizewuma.pdfIn PDF document text
- http://vom-ragnaroek.de/uploads/file/40747853691.pdfIn PDF document text
- https://www.hkfew.org.hk/ckfinder/userfiles/files/43215547263.pdfIn PDF document text
- https://isosklo.cz/uploads/bixedefekudi.pdfIn PDF document text
- http://ylphs.com/ckfinder/userfiles/files/gubisekaw.pdfIn PDF document text
- https://prcomponents.com/ckfinder/userfiles/files/wagaloji.pdfIn PDF document text
- https://girilawfirm.com/content_files/files/28695092141.pdfIn PDF document text
- http://asustainable.com/global/file/67399853137.pdfIn PDF document text
- https://basundharamart.com/userfiles/file/1616703352.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=redmi+note+6+pro+genshin+impactPDF link annotation
- 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_off0000b4a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB4A6	17656 bytes
SHA-256: `4313bdd4c0ceb3252d141d7a0301057af02fdd4ae29aa2f01826a9148c237576`
`font_01_sfnt_off0000e18e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE18E	11128 bytes
SHA-256: `5481f9407a41f0e06a1a0ebab5d49ca7130ab2c1849f3c7d3932d5603cb1b07d`
`font_02_sfnt_off0000fb22.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB22	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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