Malicious PDF — malware analysis report

Static analysis result for SHA-256 85796a8dcd9e227f…

MALICIOUS

PDF

51.6 KB Created: 2020-10-29 03:16:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 657949ddd2c973ab0a0aa4627df66aa4 SHA-1: d9c85448bb31d785f290d0d92f4e6d4bf49c1323 SHA-256: 85796a8dcd9e227f5fc222ce1caf065c7c807a64977218495c575be3a8821c6b
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://cctraff.ru/strik?keyword=get+the+message+math+worksheet+answer+key In PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/8709547.pdfIn PDF document text
    • https://pasabegimukug.weebly.com/uploads/1/3/4/2/134265340/baab95d15b3.pdfIn PDF document text
    • https://zavigajigufuf.weebly.com/uploads/1/3/1/6/131637719/c87d0c3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378853/normal_5f8caa1092d1b.pdfIn PDF document text
    • https://rajuvafawomok.weebly.com/uploads/1/3/4/4/134455823/pawajilo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_5f981b36731aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381105/normal_5f8e7ef9b18a3.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/2966987.pdfIn PDF document text
    • https://mijelowiwiloz.weebly.com/uploads/1/3/1/1/131163856/zaberimov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367271/normal_5f87cd7b3552a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f873a9d023b8.pdfIn PDF document text
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/1731924.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/sipatoxitodabu.pdfIn PDF document text
    • https://gozekukapitob.weebly.com/uploads/1/3/4/4/134443516/rikalux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415962/normal_5f99faf234fad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381081/normal_5f8d1494986ae.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/19ae874f-dabc-41b1-9da6-262e7b17d12b/rewezuwuremoxetesibetebir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f2cf315-81bb-43da-b8ad-b93144f60c9c/82047852096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1b672e7-1952-4c1f-95e7-6a2c4939a833/snoh_aalegra_feels_zip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91b9dd73-87af-4cd6-bcfe-2abbc384928f/87369571171.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_off00007b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B2E 5096 bytes
SHA-256: 245dd0768acd3993d97a40ca224229f6a4c2bd7583275e392ec9b17e07a31396
font_01_sfnt_off00008c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C6C 11120 bytes
SHA-256: a606f996d7ee5d6f2b94411511bc284880c779d5375d14574cf10dbc0900260e
font_02_sfnt_off0000b26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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