Malicious PDF — malware analysis report

Static analysis result for SHA-256 0702870363da6d17…

MALICIOUS

PDF

87.1 KB Created: 2021-04-02 02:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d0c5cd88588317dd5cc869380aec0647 SHA-1: 22078727c76fafb8528b797222d612e771ab32b9 SHA-256: 0702870363da6d176012485078183501c4664550ef9ef48753d933009cc6b29e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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 https://kuzutuzo.ru/wix?keyword=apk+fire+emblem+heroes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467298/normal_6066364f7b7db.pdfIn PDF document text
    • https://pabedowilopore.weebly.com/uploads/1/3/1/1/131163579/9757164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415740/normal_604fec1862b84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369671/normal_5ff0ae5a773fb.pdfIn PDF document text
    • http://boxapuxa.22web.org/active_and_passive_voice_solved_exercises.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421199/normal_5fd9e9d223156.pdfIn PDF document text
    • https://sukuwakutas.weebly.com/uploads/1/3/4/6/134603616/11d842077eb59.pdfIn PDF document text
    • https://xuxamiwi.weebly.com/uploads/1/3/4/6/134624415/6892655.pdfIn PDF document text
    • https://bulireta.weebly.com/uploads/1/3/4/7/134727307/8999384.pdfIn PDF document text
    • http://wazalugele.22web.org/bearing_size_calculator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461211/normal_6046330e81f11.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_6e5fc135eba448ca9c5b9434307da21c.pdf?index=trueIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_b04143f2fb904f54b881ec65fd96288a.pdf?index=trueIn PDF document text
    • https://b585a76b-fab5-4024-b0d2-f3ad95444197.filesusr.com/ugd/404203_0cc93a48acd1440e8922fb35ab349144.pdf?index=trueIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_32ac8ef500a84abc89cae98bcf7cf3e7.pdf?index=trueIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_99ff2ed68ffb4e9e920e58c2b9c6e33b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xozeb/maze_runner_the_death_cure_full_hd_movie_download_dual_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ca34f5f-8212-445c-a9f8-d460ccd2f19e/how_do_you_connect_onn_bluetooth_in_ear_headphones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86800d05-52c2-42c3-babd-b777ef1c9aa3/the_scarlet_letter_chapter_6-8_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/6995056074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4081e41d-823b-485c-8a68-552e094e51c2/totipumekapebigerabitejan.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/coron_palawan_resorts_information.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.

FilenameKindSourceSize
font_00_sfnt_off00010ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE5 2900 bytes
SHA-256: b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
font_01_sfnt_off00011528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11528 5124 bytes
SHA-256: 82ad3f5290ebd308621c1422b7af9b22208e5db4dcca172a0c39ba628723d024
font_02_sfnt_off0001266b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266B 11380 bytes
SHA-256: 2adea9888b14d5707b66fa09058b22db5240535035184c79e6d5d65adfcdd961