Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf7dd06147f6523b…

MALICIOUS

PDF

80.8 KB Created: 2021-03-08 12:06:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 30212b87351cc1dde11585c0eadb5a60 SHA-1: 3628ba62595d430af7be8ac9b4923bd3609d9133 SHA-256: bf7dd06147f6523b0df9f063f9405245ab9415be5aa44cec60a221aca8ea51a3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest the document is designed to redirect users to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/wix?keyword=city+guide+x+boston PDF link annotation
    • http://jakesubinosol.scienceontheweb.net/83828785806.pdfIn PDF document text
    • http://nunesop.scienceontheweb.net/kufetezudopobupano.pdfIn PDF document text
    • https://cdn.sqhk.co/bupitagalir/ifggeYs/game_recorder_apk_download_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwopaperuv/zeQZQje/shift_io._jelly_shifter.pdfIn PDF document text
    • https://cdn.sqhk.co/vofonowul/9niaKjg/57734869280.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/IidUo0x/gevawakuruvutosenewovuni.pdfIn PDF document text
    • https://cdn.sqhk.co/sirejeforox/xoghicF/69530591710.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c4dbbad-60ec-4a87-9d08-1790326970e4/why_is_my_fios_box_blinking.pdfIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_59770a73e0d541b3b05c88567b492a02.pdf?index=trueIn PDF document text
    • http://gunagiweraji.rf.gd/mueller_report_podcast_lawfare.pdfIn PDF document text
    • http://mafakizukizunof.epizy.com/breville_bov450xl_mini_smart_oven_with_element_iq_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ea9eb1-c23a-43a4-b13c-e689861e436f/69888502431.pdfIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_db61e337907344e1b28caa7482bcefc6.pdf?index=trueIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_45bcece5476444919d9174492be95e96.pdf?index=trueIn PDF document text
    • http://vobuxex.epizy.com/hybrid_auto_dialer_gsm_pstn_manual.pdfIn PDF document text
    • https://73b3f487-90f5-41a6-bf44-750372f72efd.filesusr.com/ugd/39e8d0_1a7e92703e0e4d6d8d14cae6b45f93bd.pdf?index=trueIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_4290cf9f3cdf4c9cbb4221a4d2d1e496.pdf?index=trueIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_90611c87b9a942fda332c1798d0ce888.pdf?index=trueIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_38189fa974774de68a941301b062c8cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6b9f87a-67fd-4c2c-a25d-6336977c1fda/37832534866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1408dfee-27b2-4d19-a612-bd1bcb83720d/breadman_plus_tr845_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3caa2b45-8169-4cb3-996a-98c5c4840a0e/nyx_cant_stop_wont_stop_concealer_color_match.pdfIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_2f283b7b51e14558b6001cac09254b05.pdf?index=trueIn PDF document text
    • http://boxijekew.atwebpages.com/saeco_talea_giro_plus_repair.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_off0000ffc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC8 4868 bytes
SHA-256: a36b58aff76ae713cd2c196053c4b284985f2adea12001abb7579450753f8d27
font_01_sfnt_off00011079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11079 10916 bytes
SHA-256: 5359f0e1435b3c26482c965cc59aa24273ef60030763b3ee85a1dda9813f5493