PDF malware analysis — malicious · 18ae4f5c0b19d147

MALICIOUS

PDF

68.1 KB Created: 2021-01-11 11:42:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11

MD5: 866da40dfe9eda9459388390d7e5d0d9 SHA-1: 6ec160a0f98f60690774b95f4cf14ed0fe2ad85e SHA-256: 18ae4f5c0b19d147b6eb3fc49e707e036e765f568325a6cd05b3bdf242e5cd6d

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with a high-risk score. It contains an embedded URI pointing to a suspicious domain, trafffe.ru, which is likely used for phishing or to serve a secondary payload. The document's metadata suggests it was generated by wkhtmltopdf, a tool often abused to create malicious PDFs. No scripts were extracted, but the presence of external links and the overall detection profile strongly indicate a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 4

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://trafffe.ru/123?utm_term=patterns+of+interaction+history+textbook+pdf PDF link annotation
- https://site-1175575.mozfiles.com/files/1175575/60614956209.pdfIn PDF document text
- https://site-1168031.mozfiles.com/files/1168031/65112854160.pdfIn PDF document text
- https://site-1178709.mozfiles.com/files/1178709/antibioticos_oftalmicos.pdfIn PDF document text
- https://site-1171534.mozfiles.com/files/1171534/brick_buster_cash_out.pdfIn PDF document text
- https://site-1173352.mozfiles.com/files/1173352/luke_bryan_farm_tour_2019_song_list.pdfIn PDF document text
- https://site-1168368.mozfiles.com/files/1168368/81497877820.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/tikoweravisixu/gophish_email_templates_github.pdfIn PDF document text
- https://s3.amazonaws.com/sojebelevenex/comparing_decimals_least_to_greatest_worksheet.pdfIn PDF document text
- https://s3.amazonaws.com/zibenoroduzuw/driver_card_wifi_tp_link_wn781nd.pdfIn PDF document text
- https://s3.amazonaws.com/toguvaju/billboard_hot_100_january_2019.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ccce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCCCE	5588 bytes
SHA-256: `38db70ae5f98678ab6ca9d0bae5f64d851796fb309c62278edf703938956d949`
`font_01_sfnt_off0000dfd3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFD3	10540 bytes
SHA-256: `e1762ef2d55643a2d330b48526443b20ef693c39f79807e063fdd1afe2fcf704`

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