Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b306aa93dab5295…

MALICIOUS

PDF

69.5 KB Created: 2021-03-18 06:09:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e179e5f3bbc2c1f56f3715a6630b4de1 SHA-1: 9804f49a25489ce48ef9079de5036565fa10ade8 SHA-256: 4b306aa93dab5295220c78b337e7014a02ef0dfe5dc3007691f61d7d4ba561ab
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO spamming campaign. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9673

Heuristics 4

  • 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
  • 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://jacksth.ru/award?keyword=parestesia+causas+pdf PDF link annotation
    • https://cdn.sqhk.co/nofevemumidu/jZhjIMC/pinball_free_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/xejadukoxeta/jggmOij/illawarra_rugby_league_2020_results.pdfIn PDF document text
    • https://nazuvunu.weebly.com/uploads/1/3/4/4/134438845/af4fa6d48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470231/normal_5fedfd8c28fd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468268/normal_603046852aa1d.pdfIn PDF document text
    • https://kuwofepex.weebly.com/uploads/1/3/2/7/132740654/batewi-vozegevonutepo.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/kebojadut.pdfIn PDF document text
    • http://tutavizukatafoz.22web.org/masked_singer_season_1_lion_performance.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/Zgihcja/95247598121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_6029de2f6a0a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409114/normal_604d20cde851c.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/jc5jhid/commander_genius_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497348/normal_5fe32d75ac665.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/a336190f-a52b-490f-8887-a17b35beab7a/harry_potter_half_blood_prince_chapter_summaries.pdfIn PDF document text
    • http://rolozaj.epizy.com/powerscore_logic_games_bible_2018.pdfIn PDF document text
    • http://buzekarutazobe.rf.gd/chimera_no_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/260b2eb9-d385-4493-bfd6-590248238e2a/multiple_possessive_nouns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50da06ab-8a37-4826-8e02-9fc374dd6ee8/coach_quilted_vest.pdfIn PDF document text
    • http://warasokimujirij.epizy.com/how_to_calculate_relative_atomic_mass_of_an_element.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f536a8-26ce-466f-b3fb-c316ec5802d6/jaliwigomaxudinemuvuke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fe7bc9b-e099-403a-bc07-6370640726ff/how_to_replace_switch_on_rainbow_vacuum.pdfIn PDF document text
    • http://susegemosesipul.epizy.com/ariens_deluxe_28_snowblower_engine_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/477eaad5-6edf-4627-be7a-edf34e0209ed/gefetitagej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b681a80-6d67-4279-acf7-501e264adcb5/harry_potter_book_cover_collage_puzzle.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E2 5116 bytes
SHA-256: 008af43a5e1c7f74a922cb8930a48751ef4f64dbb19d56970efb6494dd1efa70

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