Malicious PDF — malware analysis report

Static analysis result for SHA-256 1237a1b7a2bc0b80…

MALICIOUS

PDF

79.3 KB Created: 2021-05-02 00:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ea39e2a800b6a7d168ea95c6a758fb02 SHA-1: d3d79b70d5d92156179a138d53073c3f548c18a7 SHA-256: 1237a1b7a2bc0b80f654174e2e34a5f8166afea13ba673c101dfddfb0c6f477a
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and acting as a link farm, which is a common tactic for phishing or scam operations. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests an attempt to redirect the user to a potentially harmful site. No scripts were extracted, but the overall structure and URL distribution point towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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://leonvi.ru/strik?utm_term=where+to+buy+club+car+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407756/normal_6014fdceef0a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465263/normal_6001a5ed7847f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370746/normal_5fe2c12206153.pdfIn PDF document text
    • http://uspeh.icu/who_makes_diehard_gold_batteriesu0gnk.pdfIn PDF document text
    • https://konilusikiwi.weebly.com/uploads/1/3/3/9/133986353/zowab.pdfIn PDF document text
    • http://bukawavado.medianewsonline.com/tube_digestif_des_insectes.pdfIn PDF document text
    • http://fruit-citrus.space/21861559688fnpea.pdfIn PDF document text
    • http://mavitrade.com/topavanoritum0zmb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493602/normal_5fd799e8deb2d.pdfIn PDF document text
    • https://bamegipizof.weebly.com/uploads/1/3/4/6/134647446/3966024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407777/normal_60567299ee46d.pdfIn PDF document text
    • https://wipigoxexidon.weebly.com/uploads/1/3/2/6/132682030/ketagogomuwapa-firotekoxapilem-badowawonixaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471971/normal_60623feeb80cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501046/normal_5ffbae9e48a9b.pdfIn PDF document text
    • https://wefikugozakilo.weebly.com/uploads/1/3/1/0/131069992/8067547.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391314/normal_60519c6bd00cd.pdfIn PDF document text
    • http://devubowoku.mypressonline.com/94341135674.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495269/normal_5ffe7f536262b.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://s3.amazonaws.com/nedijowewoded/92335846535.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/teach_your_child_to_read_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/battlefield_4_license_key._txt.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/altec_bucket_truck_accessories.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_off0000ebb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 5004 bytes
SHA-256: 1839057074f53a9ac851843ad7aec91ed5339e79096a11be2b908da6645181ac
font_01_sfnt_off0000fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 10968 bytes
SHA-256: 0c8fd3ac98a9c7d4e885359a6a9aa68901e1a0b9c387b0fe80c1a3a3be9752d8
font_02_sfnt_off000121d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D6 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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