Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a11bb0071f23da3…

MALICIOUS

PDF

68.7 KB Created: 2021-06-11 18:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 47bca13541535f8e0b1c7fca4598942e SHA-1: a8822bc4b9a75804b01651f445a4f4d555b3d903 SHA-256: 2a11bb0071f23da38352efbfd77c8ca905655a5f88dd8c62df4a901d0728bdd1
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to a link farm hosted on disposable infrastructure, identified as malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://crophysi.ru/123?utm_term=what+guided+reading+level+is+dork+diaries In PDF document text
    • https://cdn-cms.f-static.net/uploads/4460045/normal_6041362a12b31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378152/normal_60b8446c4dd68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484103/normal_5fca934b88385.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447251/normal_603c7122d0ee1.pdfIn PDF document text
    • https://xelekukoxenafo.weebly.com/uploads/1/3/7/5/137513843/b7eb637268.pdfIn PDF document text
    • https://mizegagemogu.weebly.com/uploads/1/3/4/6/134602102/mosujowuta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475997/normal_6046dd7996c4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuvevetub.pbworks.com/f/20312327808.pdfIn PDF document text
    • http://banusiv.pbworks.com/w/file/fetch/144442068/51351819569.pdfIn PDF document text
    • http://xutosop.pbworks.com/f/samsung_vrt_steam_washer_wont_spin.pdfIn PDF document text
    • http://xivoxibuza.pbworks.com/w/file/fetch/144951084/cambridge_igcse_business_studies_fourth_edition_answers_chapter_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6630ec9-1552-4288-9bdd-90c5aa9ec987/how_to_install_google_maps_on_iphone_7.pdfIn PDF document text
    • http://vibasuvezuz.pbworks.com/f/present_perfect_and_past_simple_explanation.pdfIn PDF document text
    • http://joxakuruvi.pbworks.com/w/file/fetch/144650178/sleigh_ride_flute_sheet_music.pdfIn PDF document text
    • http://jugakob.pbworks.com/w/file/fetch/144821127/mupasejoriwutenadojil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0340023-cc70-45c7-b784-e8a6d3034100/wajasutuka.pdfIn PDF document text
    • http://finatin.pbworks.com/w/file/fetch/144568938/35913827420.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144423816/kizubodoxeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/324b6977-0141-4af7-bebb-b90c846f0667/how_to_do_rational_fractions.pdfIn PDF document text
    • http://pivumiraw.pbworks.com/w/file/fetch/144837027/77244285994.pdfIn PDF document text
    • http://jivevisubido.pbworks.com/w/file/fetch/144601575/john_deere_54c_mower_deck_parts_diagram.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_off0000cdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC0 5224 bytes
SHA-256: ba83abbc46aac0f373560d4a484ab4620db97e60b5bf53e821dd1bd95bfa154c
font_01_sfnt_off0000df8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8D 11256 bytes
SHA-256: 14a603f1961671d9674dbee0ab6f83362ee1d2886339b734c21c368d18e8e80b

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