Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf8c9ee03fcc2db…

MALICIOUS

PDF

86.3 KB Created: 2021-04-19 09:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b60b3954e5eda69e45bfd184e0d7f162 SHA-1: d47fecc8ef321caba941fe62f9f859c8847399d1 SHA-256: 3cf8c9ee03fcc2db1e0d5df606da22280f8cbf8fe3048b0904cf9366131e7947
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO spam or to direct users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious or spam content. The primary attack pattern involves leveraging external links for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://vilenefex.ru/strik?utm_term=how+can+i+be+a+good+intercessor
    • https://cdn.sqhk.co/wajewukudino/jbjchaK/vitamin_shoppe_locations_in_california.pdf
    • https://cdn.sqhk.co/gimenuxot/hwraAL4/armor_blitz_codes.pdf
    • https://cdn.sqhk.co/nujamuxeg/hbCuhb4/71598374005.pdf
    • http://fofumumitem.medianewsonline.com/character_animator_tutorial.pdf
    • http://sunufosabupes.scienceontheweb.net/best_paper_shredder_for_home_use_reviews.pdf
    • https://zikawudewodag.weebly.com/uploads/1/3/4/5/134585044/c8207d5e56.pdf
    • http://juvizex.sportsontheweb.net/77177666417.pdf
    • https://cdn.sqhk.co/fogibadeku/KoLiiZL/zombieland_saga_characters_deaths.pdf
    • https://cdn-cms.f-static.net/uploads/4495399/normal_606e296157603.pdf
    • http://boketizabujig.scienceontheweb.net/statistical_analysis_of_rainfall_data.pdf
    • http://bisibometixo.mywebcommunity.org/what_is_take_2_tablets_daily_mean.pdf
    • https://fiwadevu.weebly.com/uploads/1/3/4/5/134592392/koxugakutedap_tedilovam_pigamigabix_wabobomiwuvuxuz.pdf
    • https://cdn-cms.f-static.net/uploads/4466411/normal_60117bb563468.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lofoxos.epizy.com/kutitemejerowul.pdf
    • https://uploads.strikinglycdn.com/files/7dcc3a26-1fc3-4ed5-b973-10aca2fa9f85/fifty_shades_freed_netflix_release_date_uk.pdf
    • http://wosumobikufiw.rf.gd/history_of_shivaji_maharaj.pdf
    • http://zelobiliteriwe.rf.gd/animal_crossing_city_folk_wii_u.pdf
    • http://poxabeb.rf.gd/what_is_the_meaning_of_nth_term.pdf
    • http://duzatip.rf.gd/bank_clerk_exam_syllabus_2020.pdf
    • https://uploads.strikinglycdn.com/files/ed456646-ed0d-434e-a983-a22c24fbd087/winalodenudurufiwivuveri.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_off000113a6.bin
3bd468b4ead5b91f61a27c30d3f5898dc1f915c7969be69aed92f8fe97ea1329		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 5268 bytes
font_01_sfnt_off000125ab.bin
59d254d92a4259bba0070f8647d3a505013f10494ddf7b69e44d65888733a39b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125AB 11240 bytes

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