Malicious PDF — malware analysis report

Static analysis result for SHA-256 23bffef0826d1562…

MALICIOUS

PDF

78.0 KB Created: 2021-03-01 02:34:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 31b290835c1ac8e48a395d4701857f16 SHA-1: 71678dd92746c119ca737cee45800989d60534dc SHA-256: 23bffef0826d1562d2a8df614ff9b6297ef0ad6d7602c0bbbbd2b3cb85b44833
96 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 other PDFs, suggesting a link farm or SEO manipulation tactic. One of the primary external URIs, 'https://leonvi.ru/123?utm_term=how+to+make+beats+solo+hd+wireless', appears to be a lure to a content farm. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://leonvi.ru/123?utm_term=how+to+make+beats+solo+hd+wireless PDF link annotation
    • http://bajigesupin.iblogger.org/war_of_the_worlds_watch_online_with_english_subtitles.pdfIn PDF document text
    • http://zuregazezoral.mygamesonline.org/52701211093.pdfIn PDF document text
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/8945137.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/the_black_cat_vocabulary.pdfIn PDF document text
    • http://wejaduz.mypressonline.com/miwokozarisobonofu.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/nurse_salary_in_south_africa_per_year.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nefagolom/arthritis_uk_shoulder_pain_exercises.pdfIn PDF document text
    • http://retuguru.epizy.com/38895405174.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/tamil_actress_cute_photos_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/93507621500.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/up_board_2019_class_12th_date_sheet.pdfIn PDF document text
    • http://zowofiz.myartsonline.com/banezopagukinidura.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/does_feng_shui_bracelet_work.pdfIn PDF document text
    • http://ganusigesu.rf.gd/29817561107.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_off0000e8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CF 5004 bytes
SHA-256: 59491bc88771f6264ce4afe145b01b0534e80ee168188d58d9fa4bc324bbbaa5
font_01_sfnt_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 10212 bytes
SHA-256: 58d299dcfc0b6ec911984f5f7136e70ad6b7e03d7d40fe9e6abc98f7ebb7ca8e
font_02_sfnt_off00011ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE5 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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