Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aba3b647c3ee59f…

MALICIOUS

PDF

79.7 KB Created: 2021-03-26 08:39:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a4d9a22bc345a74a66f6afe0bf6f0fd SHA-1: fb5c3ed2d0f76e88262a27599e2da6ab18270f4f SHA-256: 2aba3b647c3ee59fc749018fcf13dce557bf376b9f157cdb3679c3bc5898e94f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to host a large number of external links, likely to distribute malware or conduct phishing. The embedded URLs point to various PDF files hosted on external domains, which are likely part of a link farm or a content-delivery network for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/123?utm_term=heredity+worksheet%2523+6+answers
    • https://static.s123-cdn-static.com/uploads/4452392/normal_5feb56d9a6707.pdf
    • http://crysety.xyz/child_and_adolescent_development_theoriesi8tj6.pdf
    • http://bilet-pdd.site/how_to_create_a_pre_and_post_testlm77i.pdf
    • https://cdn-cms.f-static.net/uploads/4492529/normal_602c1df046d2c.pdf
    • https://cdn-cms.f-static.net/uploads/4384167/normal_6029c7fa5f6ac.pdf
    • http://lemuxatazewazov.iblogger.org/fivesa.pdf
    • https://cdn-cms.f-static.net/uploads/4446642/normal_60307c223281c.pdf
    • https://cdn-cms.f-static.net/uploads/4454436/normal_60519cfd34898.pdf
    • https://cdn-cms.f-static.net/uploads/4470380/normal_600be1871b3f0.pdf
    • https://cdn-cms.f-static.net/uploads/4384304/normal_6039e417f4049.pdf
    • http://nekretnine.site/depigrvgi0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://03a45e23-20c9-4b13-8d21-50c2609e56df.filesusr.com/ugd/502f3d_c7152844dcc3471e923a8f2550c6278a.pdf?index=true
    • https://58fabbca-0322-4868-a582-948aa19840f9.filesusr.com/ugd/93748c_c751b06795d54c088551e6a6841729ba.pdf?index=true
    • http://jomuxesejasiv.epizy.com/62936390714.pdf
    • https://s3.amazonaws.com/jazuravazaguz/73885064523.pdf
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_76c1f452dcb04aecae4d62b4304d2081.pdf?index=true
    • https://s3.amazonaws.com/gofilafixu/38372676671.pdf
    • https://s3.amazonaws.com/zamuriza/addy_nagar_new_song_2015.pdf
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_73acb53a9fda42dfa961b3a2cedd99cd.pdf?index=true
    • 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_off0000fabb.bin
dc4c4526a848266484c176a31961961b26c6a4a1740a4aff6895083a2fa2cc0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 4888 bytes
font_01_sfnt_off00010b69.bin
a4d6270218b6abb63925faa50300aca16ca860e78bd16d42758a038448f4fdbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B69 11140 bytes

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