Malicious PDF — malware analysis report

Static analysis result for SHA-256 830883560107cbd0…

MALICIOUS

PDF

88.1 KB Created: 2021-03-26 19:52:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7309a458cfa1be580567457361159258 SHA-1: 52ef940ace843a42d981f3a1a5405e8bf6f4f409 SHA-256: 830883560107cbd089d44d8f8b5fcf2a106f56ad339092f832d5463d9353d4a6
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain, identified as malicious by ClamAV and ML classifiers. The document body, though heavily obfuscated, suggests a lure related to a 'homeostasis worksheet'. The presence of an external URI and the overall detection by security tools indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/123?utm_term=homeostasis+worksheet+with+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404108/normal_5fc8430ccdc09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_603bf25634819.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/jf2PjaA/snake_io_mod_apk_revdl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485176/normal_5fcd9aa03b19c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426423/normal_605521c09f17a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451018/normal_5fe69b549e0cf.pdfIn PDF document text
    • https://cdn.sqhk.co/jilelemo/idjfHje/xejazuzatusenewivela.pdfIn PDF document text
    • http://tigukifi.getenjoyment.net/23413636056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464068/normal_605d008aa66f2.pdfIn PDF document text
    • https://cdn.sqhk.co/raguwubives/gePjaj1/vebododulaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468261/normal_5fd2ceb89e351.pdfIn PDF document text
    • http://jisetatiloro.scienceontheweb.net/61837761602.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4b80db7-d56a-4387-af05-454cf0bdec69/jawinedofili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37414906-527f-4d65-b11a-f601a6e7b6d4/pesowobavikatowun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95405422-e250-42d6-9e74-21c235433f61/bapijafido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e302ea00-8935-4c2e-a982-35fc6ee1d17b/el_arte_de_amarte_por_nappa_frases.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3d24ff5-698a-4d3f-b167-ef9f8542ebe5/92242860556.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce1d3bb-912f-41ca-a718-a217cf544a77/41311515196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/597c21d6-aa44-4066-a4a9-57288d785840/pozutinipowenimaxotarofuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b2a1a83-1bd8-43a6-bf9e-7039a2b1a8d8/busow.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_off000113a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A0 2828 bytes
SHA-256: 4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9
font_01_sfnt_off00011d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9B 5008 bytes
SHA-256: 646ea034b4c17075dd8f91c7369f8ebdb7bfd2901cb2d698f4cd41f60387310f
font_02_sfnt_off00012e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E82 10052 bytes
SHA-256: 91486f17b9c18c52ef2e7c1179f7bc13dc2e52d39f6b0ac539f051447a25ba94

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