Malicious PDF — malware analysis report

Static analysis result for SHA-256 1521c2df74b09c09…

MALICIOUS

PDF

215.2 KB Created: 2021-03-14 23:24:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae031e77833fc7e07974bbbe88bbe9fe SHA-1: 5b66e0f017aaef7f29eaa942d3d09eed6d08b0f7 SHA-256: 1521c2df74b09c0936aad181aeb59a3d84bafd4d1ec4dc9cb9f7b5bbf22df6ec
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'zajinet.ru', which is likely a phishing or malware distribution domain. The document body, though heavily obfuscated, suggests a lure related to a 'codex' or guide, consistent with social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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/strik?utm_term=chaos+daemons+codex+pdf+vk
    • https://cdn-cms.f-static.net/uploads/4383805/normal_5fdc804c06de1.pdf
    • https://xupemapimosow.weebly.com/uploads/1/3/0/7/130776757/5524684.pdf
    • https://static.s123-cdn-static.com/uploads/4487413/normal_5fc8e95221b4c.pdf
    • https://cdn.sqhk.co/nesunarimu/fYgc1L8/molto_and_dc_superheroes_list.pdf
    • https://cdn.sqhk.co/kasuwajavi/Uzhebjg/97835924040.pdf
    • https://cdn-cms.f-static.net/uploads/4462093/normal_601eff73c9e05.pdf
    • https://cdn.sqhk.co/taxeseta/iicQR9h/69484499290.pdf
    • https://mejekuveko.weebly.com/uploads/1/3/5/3/135392268/zalerufumus.pdf
    • https://cdn.sqhk.co/mojupesonon/jjkghhf/69637319436.pdf
    • https://zewemoledomuro.weebly.com/uploads/1/3/4/7/134746436/zitali.pdf
    • https://xaviloxoganobe.weebly.com/uploads/1/3/1/3/131383750/4664808.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://559ef5b4-38f4-491c-95f5-a6f57f0534fb.filesusr.com/ugd/1b862a_62cf870a311e46d0b6d3d4fee375fec6.pdf?index=true
    • https://s3.amazonaws.com/lotibabakuj/demonic_gorilla_guide_osrs_2018.pdf
    • https://s3.amazonaws.com/kikunojulejuj/how_to_cite_an_online_newspaper_article_in_apa_6th_edition.pdf
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_a0a7e706b1cd4954a81688a524d64a7f.pdf?index=true
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_097d265bd4b445ee8117a05a8d9d93ef.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5fbd8c5b-9460-47d9-a423-fbbfe7256569/74202960358.pdf
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_52467cc0bcbe4868906c766a1ec387b8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c806a1c0-4900-4a52-a4af-c8ae02bda048/40571717756.pdf
    • https://s3.amazonaws.com/xovekolamoxe/basic_cinematography_techniques.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00031486.bin
42ba7f43db7894965f9656f1609bbbb81a99e34eed85385a7fe4147b6c88d922		 pdf-font-stream PDF embedded font (sfnt) at offset 0x31486 5364 bytes
font_01_sfnt_off000326ae.bin
9eebb18ae5071bcff316e7502a4141a9a4816baf30f062e27e8980cb26955695		 pdf-font-stream PDF embedded font (sfnt) at offset 0x326AE 11808 bytes

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