Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90a8fbe7fa9e801…

MALICIOUS

PDF

74.3 KB Created: 2021-06-10 19:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5a1750bce2ba144063e449af8ef0cd55 SHA-1: cfded521d96b071ada1ed8b08ac64fad3ecc50b4 SHA-256: a90a8fbe7fa9e801a4d2e751a10462219e0ce43c92ea5c75feaa91d31c3d550e
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the primary external links is to 'crysiq.ru', which is likely the intended destination for the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crysiq.ru/pbw?utm_term=verbals+exercises+with+answers PDF link annotation
    • https://robesiso.weebly.com/uploads/1/3/4/5/134501854/wemegifigab-darimikuj-zupudumen.pdfIn PDF document text
    • https://xafudilolara.weebly.com/uploads/1/3/4/7/134744509/gixubab.pdfIn PDF document text
    • https://relabibede.weebly.com/uploads/1/3/2/8/132816075/jimovupide.pdfIn PDF document text
    • https://jukirabupunux.weebly.com/uploads/1/3/0/8/130874410/wuseku-jajosaw.pdfIn PDF document text
    • https://guzonodet.weebly.com/uploads/1/3/4/7/134724569/gedetuvutab_zarekagepabefiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374700/normal_605910b20a71d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447433/normal_6002130671f86.pdfIn PDF document text
    • https://vupikesuxal.weebly.com/uploads/1/3/4/3/134397623/1194830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_60bfb338eb1b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426816/normal_606df3d818312.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mosijiv.pbworks.com/w/file/fetch/144749856/job_resignation_letter_format_in_marathi.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/w/file/fetch/144426492/tamil_comedy_movies_2016_free_download_in_tamilrockers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5216514d-edc0-44f2-a0d1-dc6fca8e110c/kalulur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4c40622-bdaf-4dc4-a63f-99467a0c3e2f/sekenapidiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/977dc2e2-dbfb-4352-8131-7fb2003cdced/punafenasoromudosopikifet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f27f185-05d7-40cf-bc27-f441da445f30/71638727509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81102c2d-8b51-47f0-b854-7809035b4318/something_the_beatles_sheet_music.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/w/file/fetch/144668598/huawei_y3_2020_frp_bypass_apk_download_for_android.pdfIn PDF document text
    • http://wotasaful.pbworks.com/f/among_us_cartoon_cat_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b55aff99-6ead-40ee-b54d-12270c5e01ee/all_about_love_bell_hooks_book_depository.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61227c4c-7283-4b40-9a85-e1c84e6dfb70/72640805658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9787672-bbdf-4563-96a6-f5b68b92ec50/multiplying_and_dividing_fractions_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94bc0390-85d5-4ef7-bedf-2f9503716109/hatha_yoga_vinyasa_flow.pdfIn PDF document text
    • http://mikabipi.pbworks.com/w/file/fetch/144640716/how_to_replace_drain_hose_on_fisher_and_paykel_dishdrawer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84d34444-474e-43e1-8d3f-7f44bd7b4f61/what_is_regenerative_cycle.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_off0000e302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE302 5152 bytes
SHA-256: 45302ed245676484a932e502ff6fa8eff222fcfdac991d8cf7ff5694e5ac88a9
font_01_sfnt_off0000f49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 11512 bytes
SHA-256: 2041b34a6c88e2cb8403e2ea358cfa86e6babe8f1d1201476aedaff51f71cbc7