Malicious PDF — malware analysis report

Static analysis result for SHA-256 c281ee2a92d544ad…

MALICIOUS

PDF

79.8 KB Created: 2021-03-24 19:45:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 939b95bd61d8273bc919c3db1b4670a9 SHA-1: b0e5f8733b285b574ff9d1459c1b68c9f6afda61 SHA-256: c281ee2a92d544adc5fe0e9fa51730309974515b7ecfe341e2cb8787861f7bca
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristic firings indicating it is a link farm and potentially a phishing document. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of numerous external links, some on disposable hosting, points to an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/award?keyword=endospore+forming+bacteria+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375703/normal_5fff2b167fba0.pdfIn PDF document text
    • http://wide-do.top/547476574137df3v.pdfIn PDF document text
    • http://sarawavenudiwap.mygamesonline.org/additional_mathematics_textbook_download.pdfIn PDF document text
    • http://guitar.su/furomoruliwowukerg4qk3.pdfIn PDF document text
    • http://lobafor.mypressonline.com/vusojoxipowa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495400/normal_603df4d239254.pdfIn PDF document text
    • http://ecoterritory.store/tuwunizobj0kcl.pdfIn PDF document text
    • http://getsalle.xyz/tamil_new_movies_freev3o0s.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/guitar_songbook_for_pc_free_download.pdfIn PDF document text
    • http://davorivugexawu.sportsontheweb.net/lg_smart_washing_machine_error_codes.pdfIn PDF document text
    • http://chtotakoevuxom.biz/wosegetiwabajubiditatoisc1x.pdfIn PDF document text
    • http://gikodarekegov.mywebcommunity.org/vetusadixofabezenawibe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413845/normal_5ffa650aa962e.pdfIn PDF document text
    • http://wejnpowk.space/27781094658k0znd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454559/normal_60418ac827b25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408865/normal_5ff2163f8aeb5.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/bb242d9a-882f-433d-9d11-ab510f80cbaa/31580777590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/060965cb-9b76-4a99-b5d8-ac0d88d8cf24/17781255229.pdfIn PDF document text
    • https://fb5b3b17-6e6a-47c5-ae49-26eddba71e57.filesusr.com/ugd/aff7be_98fc2aa79859431993b0d37cc9f4a723.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74e7493a-1e18-4c1b-a12a-70416306631b/baby_groot_and_baby_yoda_hoodie.pdfIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_be89ea976a9c471e8b7a1e74236e3132.pdf?index=trueIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_4728fd5fa1c74091b410ba6993aba7f2.pdf?index=trueIn 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_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 5328 bytes
SHA-256: 9e14b134a7e43c3be18079c32db68b536a3c9daf79d709e82cdee83211ab173a
font_01_sfnt_off0000fe7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7E 10896 bytes
SHA-256: 8c70c4aeb319a4bb57653bcfc037a5d27f80d735e43b8cc887aed9f52f4c3ebe
font_02_sfnt_off000123c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C5 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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