Malicious PDF — malware analysis report

Static analysis result for SHA-256 a757d75245597de2…

MALICIOUS

PDF

71.2 KB Created: 2021-03-30 13:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d436bc02e0de1fa4b9210b92be86437a SHA-1: dc94b239489172b72b02b7a83cfbe5deed5e91a3 SHA-256: a757d75245597de2a5ff7f60c9c13329504759883d599761edde4f901efd86c9
132 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'Galvanized steel sheet fence' and includes urgency language. The presence of multiple disposable hosting links further supports a malicious intent to distribute payloads or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yafferge.ru/123?utm_term=galvanized+steel+sheet+fence In PDF document text
    • https://cdn.sqhk.co/dewavasese/3B6ghhg/final_fantasy_all_the_bravest_premium_characters.pdfIn PDF document text
    • https://valiwuvubeke.weebly.com/uploads/1/3/4/6/134694219/tiruzubufu.pdfIn PDF document text
    • https://ramasiwo.weebly.com/uploads/1/3/5/3/135390431/vijemape-sisadavadiji.pdfIn PDF document text
    • https://cdn.sqhk.co/worijekegir/gg3hhhc/22038549571.pdfIn PDF document text
    • https://cdn.sqhk.co/migazajigum/jhhf3ic/jegiwebuv.pdfIn PDF document text
    • https://cdn.sqhk.co/lusoxepero/mgjilgc/pool_basketball_hoop_diy.pdfIn PDF document text
    • https://tanibabinilez.weebly.com/uploads/1/3/4/0/134018029/683880.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/ijhibih/mcfarlin_umc_live_stream.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/433db0b9-a3fc-457d-b4bc-4ea82ea91181/msi_h81m-e33_front_panel_connectors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b1611b3-6e85-46de-8aa1-f043aea8e74d/28543178252.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45707e6d-8ffa-4f98-ad86-39f4d2141dd0/95356156015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c730d49-45a2-4eb2-8cb2-5fecd86b8373/zexogikixodimuladimuguk.pdfIn PDF document text
    • http://xokifenutotumu.epizy.com/51474190450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb064768-6450-46d6-b0aa-65401f584e39/what_does_selah_mean_in_the_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/faces_edges_and_vertices_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/iit_kharagpur_mba_application_form_2019.pdfIn PDF document text
    • http://pogitijerilux.epizy.com/rojinixet.pdfIn PDF document text
    • http://raziwisubuza.rf.gd/odia_dj_album_song_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/free_antivirus_software_mac_os_x.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/dekilewuxivek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d1019d-87b8-4825-b668-7e764a68dc1b/lurejaguvopox.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_off0000da07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA07 5152 bytes
SHA-256: ec54995a79f168de6a14b92b63416d9fb4528a63bb19a74c9d791d3750f4bd13
font_01_sfnt_off0000eba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 10504 bytes
SHA-256: 6d9111374a2005a2d538fb13a2c4382673d745e9d8a77904b807a33eccb217e1