Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9b22d6eec812e7…

MALICIOUS

PDF

90.2 KB Created: 2021-03-05 15:44:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0f6f1523e3fe97c32a9a2c5095094d9b SHA-1: 9238ea9621edc6bd5ea68d3c9dc58cdaab0caf44 SHA-256: 9e9b22d6eec812e7308c5d8ebe392e3e9d14a8b8af25609f6986589d0394003f
126 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though partially corrupted, suggests a lure related to 'Family Feud' to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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 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://xajibur.ru/wix?keyword=family+feud+another+word+for+mother+all+answers PDF link annotation
    • http://kefets.xyz/govuwajukowugejiwatefi1akgb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385437/normal_604189d8e5810.pdfIn PDF document text
    • http://3bki.ru/baixar_google_chrome_canary_android8ug98.pdfIn PDF document text
    • http://probkin34.xyz/gopubevebiwujimojiw7jg5.pdfIn PDF document text
    • http://chelamela.org/59206022988w3b1r.pdfIn PDF document text
    • http://bachanalytics.com/biology_miller_and_levine_chapter_2n9nfe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451945/normal_60038b1020759.pdfIn PDF document text
    • http://cparta.moscow/wepevibibonojusogunibxbbn.pdfIn PDF document text
    • http://d2-club.ru/cable_size_calculation_formula_ukixevx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421787/normal_5fc9ead781582.pdfIn PDF document text
    • http://okstore.info/11636697728xa8ux.pdfIn PDF document text
    • http://unlockdeals.shop/rudram_lyrics_in_sanskritl5a0p.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
    • http://pinavobanokewix.epizy.com/the_return_of_the_king_oscars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db9999b5-2e5f-4939-a803-e1a9306c8d72/how_to_do_analysis_and_interpretation_of_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8edc165-7a7e-4aab-bd97-d7938ed1648e/onyx_plus_toy.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/asphalt_xtreme_apk_mod_money.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/56390769191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fbd32ab-2df3-42eb-a13c-4ab54b882064/fiwikuse.pdfIn PDF document text
    • http://nataxos.epizy.com/a_connecticut_yankee_in_king_arthurs_court_plot.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/template_blogger_landing_page_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/character_bio_template_google_docs.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 5176 bytes
SHA-256: 1bcc7ce0094ca4d9514c86aa6636d43ea1007a758bc788d7d21f1686b8039981
font_01_sfnt_off00010594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10594 2528 bytes
SHA-256: 161c3714e592dcce582c42e099e6b5ea66955031a2744d76d1c98d8655006e47
font_02_sfnt_off000110c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C5 10260 bytes
SHA-256: 720f3fad5831344f3d04abf2f869a56c83e3fa425c1817cf3a6176f6edb1ac4a
font_03_sfnt_off00013423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13423 17296 bytes
SHA-256: 413990b37ae0e8bbfb5aef82528771867ff9282d4bfb28781cc4ffab8accbdfc
font_04_sfnt_off00014b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B87 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c