Malicious PDF — malware analysis report

Static analysis result for SHA-256 f883f1c227f15098…

MALICIOUS

PDF

91.1 KB Created: 2021-03-15 03:49:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3bf1a659c4de08a726f53a3925ff01a1 SHA-1: b4b11478a37e538dfe729d70a4844455262df7b9 SHA-256: f883f1c227f15098fe59a2cd5ad72f31f16a778432034bcc4c1498df16dd220a
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of external URIs suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/award?keyword=mechanical+actuators+types+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417669/normal_5feffc823c779.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449788/normal_5fcda07609f5d.pdfIn PDF document text
    • http://pimuxiv.22web.org/apple_numbers_expense_report_template.pdfIn PDF document text
    • http://armada.technology/how_to_install_mods_for_oblivioni78y7.pdfIn PDF document text
    • http://vuvuga.xyz/constitucin_mexicana_artculo_110a6xkb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_603c2f25ddda0.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/how_to_get_off_charity_call_list.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/34069097670g69ac.pdfIn PDF document text
    • http://lozhobelir.space/inside_fitness_magazine18uw3.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/d5de91db-1620-4de9-ace0-663a61dcc9c6/how_much_do_pimps_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a67a01a-b505-48ba-acc8-bbf6bfc852ec/what_does_it_mean_when_my_application_is_in_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21dd0cbe-14af-4bb7-817d-05c07141afdf/20969415118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffb5bb74-74d1-4740-b4f2-4b6602495d99/92251848776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/181c5dca-00dc-4db4-8112-f9ce71bebeca/37296604617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87b4cdf8-3cdb-4093-9369-0f0e25953bc7/cutepdf_cnet_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b95b3c69-58e7-49cf-95e5-03f1518d68e3/shark_navigator_swivel_plus_upright_vacuum_blue_nv46ref.pdfIn PDF document text
    • http://zevesijuduma.atwebpages.com/petit_prince_chapter_3_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69026fbf-d89f-48cd-b2b0-d641a30405d6/57401422859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/505504b5-76ff-485a-a4dd-c7db72fff740/bill_nichols_introduction_to_documentary_2001.pdfIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/how_much_are_the_infinity_gauntlet_comics_worth.pdfIn PDF document text
    • http://lewuxaxuzodu.rf.gd/garmin_forerunner_405_wrist_strap_replacement.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11130 5352 bytes
SHA-256: 5bbc1f75efc79780540a721dd7e91daaa9c76112a18de0357673408b7b64b8f4
font_01_sfnt_off00012373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12373 11284 bytes
SHA-256: 8257b0418f517522d16341024b3598277d64155c62825ea89c2662e762277921
font_02_sfnt_off00014a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1C 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330