Malicious PDF — malware analysis report

Static analysis result for SHA-256 add76fbf6c16a63c…

MALICIOUS

PDF

75.2 KB Created: 2021-03-21 05:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db0a568138b601b8ffa57e1b64553a8a SHA-1: 786d88fd214ba1f1834d52ce622c1a2685813579 SHA-256: add76fbf6c16a63c436ca1a2e4485b2cf70e001df4f76d0b7fafbf05fca58d42
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a link farm detection and a critical ClamAV signature. The presence of numerous external links suggests an attempt to direct users to a large collection of other PDFs, potentially for SEO manipulation or to host further malicious content. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, indicating it was likely generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://kuzutuzo.ru/123?utm_term=como+escrever+um+email+formal+exemplo
    • https://cdn.sqhk.co/pibutuvopedu/6m7R1QP/gaming_wallpaper_hd_for_fbrs.pdf
    • https://cdn.sqhk.co/kerosumumato/bwhhCcZ/59869318491.pdf
    • http://nesejanemik.22web.org/29083327717.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wazotojemov/deromuranuxujapepebu.pdf
    • http://nojubeweba.epizy.com/kendo_dropdownlist_template_mvc.pdf
    • https://s3.amazonaws.com/nilititonawafim/eulogy_templates_for_brother.pdf
    • https://uploads.strikinglycdn.com/files/ebbc06d6-5a34-49d3-9f49-0a26c39276da/wejozoxolagepugisijewu.pdf
    • https://uploads.strikinglycdn.com/files/e117af75-0822-4c7c-a42c-508ee07abdb6/difference_between_novice_and_expert_nurses.pdf
    • https://uploads.strikinglycdn.com/files/3118a44c-9ece-4828-b4ed-2ae21f9c08cc/2137848078.pdf
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_2a0517857f8b4b8c98c8c63ee8163d25.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e8a63746-da80-43f2-9b14-af9631ca8d0b/19705243024.pdf
    • https://uploads.strikinglycdn.com/files/e55053c1-ff13-44cd-a91e-ac9ce895c647/realtek_hd_audio_manager_windows_10_headphones_not_working.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/inner_child_workbook_reddit.pdf
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_d42f9d28caa34bc1b869340656f6aa3c.pdf?index=true
    • http://kefujaforu.rf.gd/galamikibalifaponotadig.pdf
    • https://uploads.strikinglycdn.com/files/7b8b113e-5169-4bb8-aec9-bf779f35c9d4/kesenanufavat.pdf
    • https://uploads.strikinglycdn.com/files/5781a0f6-9f0a-4442-81fe-6f8bc6421c1e/jonathan_livingston_seagull_book_review.pdf
    • https://s3.amazonaws.com/vexosafugunu/46393258268.pdf
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_4b2393c865964a0a822b4626e4fc9855.pdf?index=true
    • https://s3.amazonaws.com/xufoxorog/corey_wayne_book_recommendations.pdf
    • http://pinininun.rf.gd/roxeripuxudubo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e30f.bin
c1deced8c0fe96a5b1862259be776c91a62289c8da5c3c7cbbf31cbbf4843cb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE30F 5192 bytes
font_01_sfnt_off0000f4ad.bin
81c827fa3fd182a7cab1c0fae94f7bbfcb0e961bb7deef6adfadeb8b5d7a221c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 13464 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.