Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71d8dbc8e3c0b93…

MALICIOUS

PDF

88.3 KB Created: 2021-03-14 17:25:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b870fb123eae45819170f0644ade15c9 SHA-1: ef8944e6c3fb4fa7dc34ebebda4b1c65189b3781 SHA-256: e71d8dbc8e3c0b935838f1e712b9b3a19be0172645cdea9b288b302ec3602d83
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating it embeds a large number of external links. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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://xezojetit.ru/123?utm_term=unicode+nepali+romanized+free
    • http://igafnd.org/rojifabalojomibog3j0co.pdf
    • https://cdn.sqhk.co/gufezima/FigjDgg/7593916000.pdf
    • https://cdn-cms.f-static.net/uploads/4446034/normal_602611ee1d16d.pdf
    • https://cdn.sqhk.co/rufadexu/icgdexd/16682244796.pdf
    • https://cdn-cms.f-static.net/uploads/4416490/normal_603835f859b98.pdf
    • https://static.s123-cdn-static.com/uploads/4367644/normal_60019f9b73523.pdf
    • http://haustova.com/fizofif8rhp.pdf
    • https://cdn-cms.f-static.net/uploads/4379841/normal_6040ba2937d04.pdf
    • http://arendaavto.taxi/crayola_scribble_scrubbie_pets_apphv75o.pdf
    • https://vivorewipaxuje.weebly.com/uploads/1/3/4/3/134365477/401545.pdf
    • https://zabagazepag.weebly.com/uploads/1/3/4/4/134498959/xifeb.pdf
    • http://erethiztzj.space/85745453822om46y.pdf
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/3805819.pdf
    • https://cdn-cms.f-static.net/uploads/4476946/normal_601a64bc1777a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/3513b233-5082-44c6-8581-1b4fb4700ccd/grouped_frequency_distribution_table_in_statistics.pdf
    • https://uploads.strikinglycdn.com/files/13306dbf-3e1f-4c79-b321-14834254613d/leputazezufasofidajeruzo.pdf
    • https://uploads.strikinglycdn.com/files/0685153f-cfe1-40a8-ac0c-f4be5bf0e5fd/xevorakanotori.pdf
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_c9936330848642fc95a56fa0693a885c.pdf?index=true
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_a49f2ec225a247dc9603824a26f07fcb.pdf?index=true
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_7aebe274380646c9b85cf067e51a0f71.pdf?index=true
    • https://uploads.strikinglycdn.com/files/64421489-3fa6-4e28-8c0f-bdfd5c974d0a/79562553412.pdf
    • https://uploads.strikinglycdn.com/files/4f8c344d-22b4-4158-87d8-8abdf003c49f/sukafojitagananazinipaxum.pdf
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_789d2218db464d2485e35c781f0ea6a3.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb5.bin
5c3b00402aef31e7bc415248d92aae8cdbad616793ee4884895bd3e96d5703ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB5 5164 bytes
font_01_sfnt_off0000ff3e.bin
b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3E 3720 bytes
font_02_sfnt_off00010aa1.bin
a4157ca587f50a9546160b539d6ab324ecce2b9c92aafb35de9286def36906bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 11176 bytes
font_03_sfnt_off0001311c.bin
d5a53728681cdaeb355d3612c09a86bf472185af9dbd8aeaa0dee38de11048ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1311C 10376 bytes

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