Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7f54bb14700071…

MALICIOUS

PDF

78.7 KB Created: 2021-03-20 20:10:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c7321d07155394c27ae476f9f423f9e SHA-1: e892b145dc39d31576a9500409c1eb2d5cccd037 SHA-256: bd7f54bb1470007151a0c356d99af3f01c1ab2625591630860b42d8bf70ae448
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing. One prominent URL, 'https://pelibifir.ru/wix?keyword=genetics+review+study+guide+answer+key', is presented as a lure for a study guide answer key. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs suggest an attempt to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/wix?keyword=genetics+review+study+guide+answer+key
    • http://pixidilivutep.medianewsonline.com/vibazubanexekuto.pdf
    • http://lusejifunod.22web.org/boolean_algebra_in_computer_science.pdf
    • http://tafugegajotu.mygamesonline.org/gingerbread_man_story_for_kids.pdf
    • http://bimoriz.getenjoyment.net/what_is_in_the_norton_anthology_of_english_literature.pdf
    • http://rolopigabetitu.scienceontheweb.net/projeto_meio_ambiente_em.pdf
    • http://giwudogor.scienceontheweb.net/75470500777.pdf
    • http://bagomebefekixob.getenjoyment.net/42565056361.pdf
    • http://roxelejabojafe.scienceontheweb.net/sidesixizelobizef.pdf
    • http://ruwosiju.getenjoyment.net/how_often_to_replace_braun_series_7_head.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/luxelula/cuisinart_pro_custom_11_cup_food_processor_reviews.pdf
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_8beea36496124698865d53022eeb98b4.pdf?index=true
    • http://lavisekenesavof.myartsonline.com/wemuzivebazun.pdf
    • https://s3.amazonaws.com/dewutexorob/eel_river_fly_fishing_guide.pdf
    • http://japorununatoj.epizy.com/wigibulumobetopowijopulet.pdf
    • https://s3.amazonaws.com/tometubufimopim/dance_with_me_baby_maejor_song.pdf
    • https://s3.amazonaws.com/timeziso/54992659438.pdf
    • https://s3.amazonaws.com/tawovojo/reading_comprehension_worksheets_for_2nd_grade.pdf
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_a1c40b0122584a1ca18c048d76cf05af.pdf?index=true
    • https://s3.amazonaws.com/waduzirader/maya_banks_books_kgi_series.pdf
    • http://wulemut.epizy.com/tamil_actress_ajith_photos.pdf
    • http://josuxak.atwebpages.com/99259824399.pdf
    • https://s3.amazonaws.com/pusolefosex/vokadatapujapu.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_off0000f434.bin
3c0af522aa94552bc64851d754e042b81b3b57c351b5d4d69b6f63417d41dae9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF434 5424 bytes
font_01_sfnt_off000106d8.bin
d298aac9693b6d65457dda7eaa61582ec2e55ba1661b0e25a596c04305c20cba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106D8 11376 bytes

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