Malicious PDF — malware analysis report

Static analysis result for SHA-256 0685b2c998fe9389…

MALICIOUS

PDF

80.0 KB Created: 2021-03-21 01:00:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f1159c8f6389c53b3ffbcf38c0a4a951 SHA-1: 101db88ea6ab36bc95331165d86bc6e5d5f395ac SHA-256: 0685b2c998fe938962d2e67b75bf2fcd396a284117a3a1c9d60ff74e531ae25e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external URLs suggests potential redirection to malicious sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://midufefew.ru/wix?keyword=epiphone+les+paul+junior+electric+guitar PDF link annotation
    • http://ninuxalezopo.getenjoyment.net/english_grammar_book_in_gujarati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499002/normal_604d092f0cea5.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/waximojamegovino.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/JvRhbhj/97417655556.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/29104244217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469350/normal_600b0bdbe9f87.pdfIn PDF document text
    • http://ziwewixowele.sportsontheweb.net/52887724849.pdfIn PDF document text
    • http://fekowepiz.mywebcommunity.org/continents_and_oceans_practice_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/sebuwemid/gcFheie/star_wars_clone_wars_ahsoka_leaves.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/google_sheets_reference_cell_from_another_sheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384028/normal_5fdff7e7c9ffb.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/Dge0Zjd/1080522775.pdfIn PDF document text
    • https://www.andertons.coIn 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
    • https://uploads.strikinglycdn.com/files/bc334ffe-4375-4a41-9caf-3b3116575700/rowenta_garment_steamer_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ad177c5-e2e4-4c09-a90a-a523f9994296/29698852194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29e257f3-4a82-4eab-971b-b281e41da06c/14178780791.pdfIn PDF document text
    • http://nowimirozox.atwebpages.com/how_to_unfold_graco_stroller_frame.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_3a1bb3212f1d4381ba9982b7370fd283.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e648f080-cec7-43a5-9508-690e66a6d02f/tiguzufefi.pdfIn PDF document text
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_f6ba54001cc14895b0bc0abfa88881fc.pdf?index=trueIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_b5e577df7fed48a3957976feb905e552.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 5112 bytes
SHA-256: 445b955308a0c576803ef9f2337d6069ebb33776e7fe8f6b2ada948acdd336fe
font_01_sfnt_off0000fafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 11712 bytes
SHA-256: fc86e064a4c3d54b2be061ae882138aebfc9537c86078c4202f345259d7fde7b
font_02_sfnt_off0001225f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c