Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8b29e23d00e24f…

MALICIOUS

PDF

76.9 KB Created: 2021-03-31 00:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 75175f84b7d107d02ff5355b3482d59e SHA-1: b0aa80215875b93688f60fa02cceb277b99b35a6 SHA-256: 9e8b29e23d00e24f5dc81c9c623aff2edb8c788b96ee39a9714b5128eeb207df
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF documents, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://druttle.ru/strik?utm_term=what+does+homework+do+for+you PDF link annotation
    • https://vojutodebol.weebly.com/uploads/1/3/4/0/134096580/3090786.pdfIn PDF document text
    • http://vinnipoh.space/do_nissan_murano_have_transmission_problemsph9o8.pdfIn PDF document text
    • https://mosugomepa.weebly.com/uploads/1/3/4/0/134096926/1689872.pdfIn PDF document text
    • http://vashobereg.com/english_vocabulary_listmkwoz.pdfIn PDF document text
    • https://ditiboxoteripu.weebly.com/uploads/1/3/4/7/134763901/sebamufuma.pdfIn PDF document text
    • http://wowmarket.info/balada_unui_greier_mic_george_toparceanu46hm0.pdfIn PDF document text
    • https://gefivogixofix.weebly.com/uploads/1/3/0/9/130969648/wajudogerofofo.pdfIn PDF document text
    • http://keto-menu.online/reading_comprehension_test_for_grade_4xvm44.pdfIn PDF document text
    • http://idealica-italiaofficial.site/baldurs_gate_2_sphere_walkthroughtw26y.pdfIn PDF document text
    • http://loveantravel.xyz/bombshell_perfume_3._4_ozg6av7.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/mozilla_firefox_filehippo_32_bitwdm9k.pdfIn PDF document text
    • http://juilopkiretlo.ru/anaganaga_oka_prema_katha_movie_songspo1ds.pdfIn PDF document text
    • https://fapadeli.weebly.com/uploads/1/3/4/4/134445247/a328c43.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/tobobowu/afsoon_e_jaan_complete_novel.pdfIn PDF document text
    • https://1f9cfe0c-d655-4514-b58a-75380282e405.filesusr.com/ugd/d31784_f8a54952d82148858d7c60a25e89a52f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/varolexexus/carbohydrates_food_pictures_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/clinical_chemistry_and_laboratory_medicine_books.pdfIn PDF document text
    • https://ac25a69f-a984-4293-9c3d-8c9e0f062535.filesusr.com/ugd/cbf077_2897c4a5702d43d38b7e9a34d2ba6bf5.pdf?index=trueIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_0ded8c55eb3c430fbb425ced38649473.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divikufifir/airpods_2_android_double_tap.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/mastering_biology_answers_chapter_17.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/2016_toyota_corolla_le_price_canada.pdfIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_ec0d54f339fc48128e66b5359e3daa41.pdf?index=trueIn 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.

FilenameKindSourceSize
font_00_sfnt_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 5388 bytes
SHA-256: 19645f85451c452166cd5e2e60b5639c4382082fa72f904ae66aed56bbc1c329
font_01_sfnt_off00010135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10135 10940 bytes
SHA-256: 8ea3827c8170e2d785500f07635a1d92b4fe36f16a4ab9e490721623686af09a

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