Malicious PDF — malware analysis report

Static analysis result for SHA-256 330e3395e6464ba8…

MALICIOUS

PDF

82.0 KB Created: 2021-05-23 19:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 31b7bdd9b2ffb90c66648c82db8cfab0 SHA-1: 731399a5907501f97ca9c18233bee3f4dca9a1cc SHA-256: 330e3395e6464ba828595418e093cc8e08a5f8800c5f8fd777e10be39dc4c5f3
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/strik?utm_term=how+to+hack+farmville+2+country+escape+ios PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383451/normal_600597f5471c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389095/normal_5fd5f08f78e5b.pdfIn PDF document text
    • https://bejivuvepezera.weebly.com/uploads/1/3/4/4/134437422/sisele_ruluf_zorenivobulus.pdfIn PDF document text
    • https://rugexivik.weebly.com/uploads/1/3/1/0/131070765/tivulag.pdfIn PDF document text
    • https://limofagis.weebly.com/uploads/1/3/4/6/134640762/bobigiparis-luvubiveku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448113/normal_601b1022340cb.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/nuxomigo/zipufotesaxegoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff5e6212-a061-466a-bf0e-8bee478c72f8/exercice_sur_les_angles_6me_avec_correction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43811ef7-67e8-4161-a71e-abf355769f66/why_ip_camera_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/notification_sounds_wav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/283b2061-3f51-4451-a058-878fd1fb58e6/delta_table_saw_fence_replacement_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/71980590620.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/chesterfield_fc_stadium_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9bf8e73-83df-4535-8e12-b0b35021847b/10.2_simplifying_radical_expressions_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab27865f-6c04-4953-9535-efb8e39bda42/61551959818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edf5de09-addf-4b63-b164-39e96d57aa19/what_size_are_mini_football_helmet_do_i_need.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b93c12d4-9d49-47ff-a533-4556db5c4aa9/vocabulary.com_gre_high_frequency_words_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b62f19ea-a157-4b6f-8338-91a1c2c4e92e/what_are_good_spanish_girl_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c832d974-0444-4cf8-bcc2-3f22cd307b05/jedebomuluwitodisibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3acf3b3-557f-4c10-9d08-dfc811c99e9e/dozomagetaruvoxume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0c65c4f-bd84-4d8c-8639-3c32a64e948c/how_to_reset_the_badger_garbage_disposal.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 5668 bytes
SHA-256: 3423c13e7ad1238c5876e69571acff56e1ad256d1c8fdd0c4478c0df075aa3c5
font_01_sfnt_off00011079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11079 12928 bytes
SHA-256: 3a009e6db639944ff423bf8a95c24c91eeb117737e995986bc74b4b3ad80d833