Malicious PDF — malware analysis report

Static analysis result for SHA-256 f585d70cda2dd2d3…

MALICIOUS

PDF

78.6 KB Created: 2021-04-04 19:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 00b454d03f073dde85ce34e1e44034bb SHA-1: 1f4f987fce0a6523e7fc6a71cd8b6b445a9accf8 SHA-256: f585d70cda2dd2d351ced2964adfa9ec2cdae7553f161251ad756f16135404af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kuzutuzo.ru/wix?keyword=hi+guess+the+character+main+game+answers PDF link annotation
    • http://rezolawanelu.sportsontheweb.net/fasciola_hepatica.pdfIn PDF document text
    • http://mipexalazalekab.getenjoyment.net/rebudelolejeviwinejozebux.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/bwhhgdJ/72494289818.pdfIn PDF document text
    • https://cdn.sqhk.co/fekesolip/jsOgePk/vampires_diaries_netflix_france.pdfIn PDF document text
    • http://korecos.ru/list_of_trig_integralsm9bgg.pdfIn PDF document text
    • http://wownatural.fun/selugitm9zp.pdfIn PDF document text
    • https://lukafove.weebly.com/uploads/1/3/4/6/134655473/03ab6ed37b9.pdfIn PDF document text
    • http://detonicufficiale.website/adobe_reader_app_for_windowss5ydr.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/suara_burung_walet_malaysiacfake.pdfIn PDF document text
    • http://vbnmcxz.xyz/bazujizoih6di.pdfIn PDF document text
    • https://cdn.sqhk.co/duwefetufe/bZOWKhg/delelaret.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/jcjj4ij/veligavode.pdfIn PDF document text
    • https://murasujudadalox.weebly.com/uploads/1/3/5/3/135338307/laluka.pdfIn 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/b33d2284-503d-44c7-b5eb-d40e863c6941/14117521075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f9929db-efb3-4c17-a111-aec90368a1de/negukogitozexezoruxut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e4bc6a0-6e77-4c39-be1b-bbb44254093e/92773492655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18ab526a-1344-49fb-8caf-817207daacdd/26893026950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c547c918-2fbd-463f-9856-04a122c637fa/what_is_the_formula_for_surface_area_on_a_cylinder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8e3bedc-7695-4d04-8ea9-7fce34462573/kupobumamuvubimifinepup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea442bf1-dc83-4eb0-88aa-6eeb9214e911/you_should_meaning_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/834a002e-1d11-4e36-8b4d-63f457cccd43/new_yorker_crossword_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f011cff-90d4-45d8-afff-c15de89188af/biologia_celular_y_molecular_de_robertis.pdfIn PDF document text
    • http://rijonitapadon.myartsonline.com/amino_acid_codon_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35c9b51b-bd3e-4ab6-8e8e-b36bf0fd14b6/sustainable_development_goals_2015.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87F 5008 bytes
SHA-256: fb534eb451b1f70022d5be4988cc32b2f98f38799078b136e6a9764bbc7d6425
font_01_sfnt_off0000f96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96A 10832 bytes
SHA-256: a0b7d8e8d602d60010e42a295e6159b3ad39b46ee832a4f4cca6792dd81ecd37
font_02_sfnt_off00011e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3D 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c