PDF malware analysis — malicious · bd028efb5aa6813a

MALICIOUS

PDF

78.6 KB Created: 2021-01-18 00:50:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11

MD5: c158a9d9ade752c07e3187eab9a12a5f SHA-1: be528fd89c38c0ddffbbf0b16523e062dda2c162 SHA-256: bd028efb5aa6813a229db1b2ac1d0982f1a41d80f486b070fcc7e5998c490e82

224 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The ML classifier also flagged the PDF with high confidence. The presence of a 'Password-protected archive handoff' heuristic suggests the document is intended to trick the user into downloading an archive, likely containing a malicious payload, after providing a password.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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.
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://traffine.ru/123?utm_term=geologic+time+worksheet+middle+school In PDF document text
- https://cdn.sqhk.co/foxidagon/V6sEEih/30636983638.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4390996/normal_5f937eec07a71.pdfIn PDF document text
- https://cdn.sqhk.co/novimabe/ihbijai/navunusuwabajevofevaki.pdfIn PDF document text
- http://xudisoda.66ghz.com/performance_parts_for_bmw_airhead_motorcycles.pdfIn PDF document text
- https://site-1176860.mozfiles.com/files/1176860/rumigagu.pdfIn PDF document text
- https://site-1174026.mozfiles.com/files/1174026/formal_thank_you_letter_for_support.pdfIn PDF document text
- https://cdn.sqhk.co/xojurolaruk/W1jaVhj/luvonipufer.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4388620/normal_5fd99affbcc81.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4454303/normal_5fb9e9526eee9.pdfIn PDF document text
- http://dugules.iblogger.org/i_will_alison_krauss_sheet_music.pdfIn PDF document text
- https://cdn.sqhk.co/wevafofed/RTZhbjb/uc_browser_video_player_apk.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4390057/normal_5fa101b7a3338.pdfIn PDF document text
- https://cdn.sqhk.co/zebapomiz/1ieii9W/42119202489.pdfIn PDF document text
- https://cdn.sqhk.co/pelotuwew/cifhaCu/asia_bordering_countries.pdfIn PDF document text
- https://cdn.sqhk.co/sigidezok/cOeBxhi/18449625315.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- http://binasizula.rf.gd/kajiveripujikegakarikol.pdfIn PDF document text
- https://s3.amazonaws.com/kakef/mudirot.pdfIn PDF document text
- https://s3.amazonaws.com/jidosatikim/jujititunikunuparux.pdfIn PDF document text
- https://s3.amazonaws.com/fatisake/virtual_lab_population_biology_answer_sheet.pdfIn PDF document text
- https://s3.amazonaws.com/vekodupiwarobi/divekawitexotubufizol.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e841.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE841	5012 bytes
SHA-256: `ecac20d9314b0a3b0ca4edfe3ce362e740f2d09ba7c6c271441a48c878d475ba`
`font_01_sfnt_off0000f966.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF966	11120 bytes
SHA-256: `9ae9c7bbd0334cb2aa8a49c426f869f704a9e798633eeefbd83c3217c0747e34`
`font_02_sfnt_off00011eb3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11EB3	4324 bytes
SHA-256: `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`

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