Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c70863690f540b…

MALICIOUS

PDF

87.5 KB Created: 2021-03-16 16:49:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 78cb1e78a735db15874ea96528632fff SHA-1: b22a062a8fd351e5c2660edd2632c156f6762a34 SHA-256: 29c70863690f540bfe4cd2e616b4864be21d6f25f44e22258c1913943c7a05bd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of external links, with a notable heuristic firing indicating a 'PDF_SEO_LINK_FARM'. This suggests the primary purpose is to manipulate search engine results or to act as a landing page for other malicious content. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous links, including one pointing to a PDF file on 'sportplays.ru', indicates a potential for redirecting users to malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/123?utm_term=booklet+cover+design+free PDF link annotation
    • http://sportplays.ru/chrysler_service_dept_near_me4zclf.pdfIn PDF document text
    • http://help-bluebadgecustomer.com/454190155420nxhl.pdfIn PDF document text
    • http://electorat.org/libro_de_palacios_derecho_procesal_civill9uff.pdfIn PDF document text
    • http://hookup671.site/calotropis_procera_morphology9xcwa.pdfIn PDF document text
    • http://jafujofefi.iblogger.org/what_does_expression_baptism_of_fire_mean.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://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_fcca4d68864c4febbae026cac5a81251.pdf?index=trueIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_d8f3896a712f4a9a96f825f3704fea1e.pdf?index=trueIn PDF document text
    • https://6b9ff03a-ef48-417a-a14c-919df0f903d0.filesusr.com/ugd/f459ea_bdd96f98242f48b99f064a6f82d14ab5.pdf?index=trueIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_06b460eec56243d584847fe9bea2cff3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d68197f1-6854-4bcb-866f-aca9dbc1b35b/biboxoj.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/13611848714.pdfIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_fd6e1a1f868344acb80d9e9da6e027d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c1bcf73-639d-4687-b4cb-496e2e218db7/xatubeberidas.pdfIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_568cac9f7f9c4e75b71a442536048c9b.pdf?index=trueIn PDF document text
    • https://46b09160-81f9-4cb3-9cca-f7b5b0c0229e.filesusr.com/ugd/179cc6_b10a0482c56843a2b09f4d00440b6189.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/memexelu/83592373241.pdfIn PDF document text
    • http://sewugobavi.rf.gd/namujedeweku.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/spiderman_far_away_from_home_subtitles.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 3368 bytes
SHA-256: af68e5b1f937c352b93499d49ead012793058d2d46d2f20f6aa811b6a9aa50ea
font_01_sfnt_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 4940 bytes
SHA-256: 5b4a652591737ee4d8068a980a276416946ff96679735e188405acc1780f7a62
font_02_sfnt_off0001072d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072D 10960 bytes
SHA-256: 3191928b63c0fa2bfb78c65bbb9813f16b80180920ea6d7b5441455a2bd84815
font_03_sfnt_off00012cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEA 16164 bytes
SHA-256: f469c5aa689aa4c1965481b78cfaebbf1c3ebdad2306c7067134b7b4aaa0addd
font_04_sfnt_off000141e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E3 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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