Malicious PDF — malware analysis report

Static analysis result for SHA-256 11fc925175ea84a8…

MALICIOUS

PDF

123.0 KB Created: 2021-05-20 10:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e03d1f22a8040a12c8af9566d5aba49e SHA-1: e98597152bf3f6dce0d252fc6777afd53a5b4597 SHA-256: 11fc925175ea84a886e9d9eec4764f81b6590b201830d9746290e8d088fb3f42
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 pointing to seemingly random PDF files, indicating a link farm or SEO spamming technique. One of the primary external links, 'https://midufefew.ru/strik?utm_term=lakshmi+ashtottara+shatanamavali+in+telugu+pdf', is suspicious and likely leads to a malicious site. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://midufefew.ru/strik?utm_term=lakshmi+ashtottara+shatanamavali+in+telugu+pdf PDF link annotation
    • https://ritipovilij.weebly.com/uploads/1/3/4/6/134650849/gokurikozupojuz_bukumibifo_welojemo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420037/normal_600e65820f2ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453098/normal_604a1357f4194.pdfIn PDF document text
    • https://bafijesepuj.weebly.com/uploads/1/3/4/0/134041147/5470879.pdfIn PDF document text
    • https://lugapageragije.weebly.com/uploads/1/3/4/6/134617753/gizebaxapusewutusosa.pdfIn PDF document text
    • https://melijavunibujov.weebly.com/uploads/1/3/0/8/130873932/9c3eb4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/viwoxuz/pavazipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bcc0ae7-87b8-4dbd-9c49-2f461c7747f4/dugaluwiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ab1820d-1188-4068-914a-9b6516a036f3/rabbit_hole_2010_movie_online.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/why_is_my_lg_dishwasher_leaking_from_the_bottom.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/wa_story_saver_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bba8f31-a448-43cc-b9fc-2b3b407b6cb9/65523006046.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/tabla_de_distribucion_normal_n0_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca658fa9-2e72-47d5-a91e-5f449216d487/texas_instruments_ba_ii_plus_how_to_use.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/my_phone_automatically_answers_calls_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/jacobsen_s_catalyst_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4be1bd0b-5a05-4875-8207-0af2c0c69dc1/2_digit_subtraction_with_regrouping_worksheets_2nd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/all_tv_channel_apkpure.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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 5400 bytes
SHA-256: 0d9cde33a0f8bff87d0fbacbcb7004287d610472412dcf517ec11776a215231c
font_01_sfnt_off00011081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11081 2656 bytes
SHA-256: dbaab8dcf32bfe64cb008f34eb54f5316f62236e8dffe3de49b44225404383a5
font_02_sfnt_off00011b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B85 2328 bytes
SHA-256: c42118b51b061dffbc196cd4866a2cf76d9f31ae9d0a8f6c06e6ad224a677b24
font_03_sfnt_off0001263b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263B 67328 bytes
SHA-256: 235e0e87b4bc824694b149f5e9decd5e91b38977dd7adf1af3bd2f8b92a6c826
font_04_sfnt_off0001a0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0A4 9260 bytes
SHA-256: 15b3b79ffd27ea6c8720c1603f960fab2f8b83b528143ee35cb9b615fe7209ab
font_05_sfnt_off0001c07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C07D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
font_06_sfnt_off0001ce7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE7C 2960 bytes
SHA-256: add4185822790a5ee1e9c023bb8c4f1a1e7574887708d88b220de2022cbb7d57