PDF malware analysis — malicious · a18435cb7b0f7bd5

MALICIOUS

PDF

76.6 KB Created: 2021-01-18 21:46:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12

MD5: b402f25b02c57444d5b5ce0a45c354fb SHA-1: 11b6a7f2864984ec1095e8d8d83f887fa34029cc SHA-256: a18435cb7b0f7bd5727d8450ef39496f3bbf79c801a9d77362d76cbb4b6337f1

224 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution T1071.001 Web Protocols

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document also employs a social engineering lure, prompting the user to install a browser extension, which is a common tactic for credential theft or malware installation. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan.

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.
Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE

Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
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://yafferge.ru/123?utm_term=70-410+pdf+free+download In PDF document text
- https://cdn-cms.f-static.net/uploads/4379856/normal_5fa4a4de3eb66.pdfIn PDF document text
- https://site-1177153.mozfiles.com/files/1177153/real_drift_racing_full_version_apk_free_download.pdfIn PDF document text
- https://site-1178069.mozfiles.com/files/1178069/ruxarubokojagedukikalon.pdfIn PDF document text
- https://site-1233605.mozfiles.com/files/1233605/crystal_report_2013_full_crack.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4480399/normal_5ff2077529716.pdfIn PDF document text
- https://site-1174752.mozfiles.com/files/1174752/make_it_perfect_walkthrough_level_156.pdfIn PDF document text
- https://cdn.sqhk.co/rewufarelaze/jgiChip/v_live_bts_jungkook.pdfIn PDF document text
- https://nizidisifa.weebly.com/uploads/1/3/4/5/134505067/gorob-lival-vufefavake-mureritukagof.pdfIn PDF document text
- https://site-1166620.mozfiles.com/files/1166620/oc_all_star_football_game_2020_roster.pdfIn PDF document text
- https://site-1196120.mozfiles.com/files/1196120/83711146370.pdfIn PDF document text
- https://cdn.sqhk.co/mumaxifup/vGifBii/super_pinball_master_referral_code.pdfIn PDF document text
- https://site-1177442.mozfiles.com/files/1177442/to_aganara_tulasi_mu_video.pdfIn PDF document text
- https://cdn.sqhk.co/gidufulelav/T5ihaig/xibovatozajeluzugedasutux.pdfIn PDF document text
- https://site-1171796.mozfiles.com/files/1171796/fps_encounter_secret_mission_best_shooting_games_download.pdfIn PDF document text
- https://sajosapisede.weebly.com/uploads/1/3/4/3/134344890/lolaburesu_sogov.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/gozilum/doxiwulutuxarisuwu.pdfIn PDF document text
- https://s3.amazonaws.com/rumezo/bubble_shooter_all_games_mod_apk.pdfIn PDF document text
- https://s3.amazonaws.com/tomaxade/reverse_chronological_resume_templates.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_off0000f07a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF07A	5248 bytes
SHA-256: `4f09c0f4f72310bb4a01be1314c1232a63f1bf2bdd141acfd218de480fd6c6c1`
`font_01_sfnt_off00010291.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10291	10072 bytes
SHA-256: `ee426203f2c34f285c855dc2d1ee061449cbb7336a79b14c1b3f5b538848a0cf`

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