Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cd1319cf75801a…

MALICIOUS

PDF

79.5 KB Created: 2021-02-12 05:29:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f231cc9480487e00088bd1000705b56d SHA-1: 12f91634498b599212048fe41906d703d4131ebf SHA-256: a9cd1319cf75801a5772c0ff605aa9a15c4e0c7eae77c0e551a02eb369af79fd
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://druttle.ru/123?utm_term=freud+introductory+lectures+on+psychoanalysis+pdf PDF link annotation
    • https://polokoxukoneg.weebly.com/uploads/1/3/2/8/132816042/1272ebe4a8.pdfIn PDF document text
    • http://cmbespaceclient.xyz/nozinazuwose7itt7.pdfIn PDF document text
    • https://webegerux.weebly.com/uploads/1/3/4/7/134759049/4404822.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416299/normal_601f0bcde05d6.pdfIn PDF document text
    • http://ebay-coupon.ru/arabalar_3_oyunu_apk_indird9965.pdfIn PDF document text
    • https://xodinelexobi.weebly.com/uploads/1/3/1/4/131438891/e8ab6d1b3f135e.pdfIn PDF document text
    • https://kazofinuso.weebly.com/uploads/1/3/4/3/134369681/bujerit_piximigu_bipezuremo.pdfIn PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/bimolut.pdfIn PDF document text
    • https://dawoxojukuput.weebly.com/uploads/1/3/4/8/134890950/kulutepovulizubiviso.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/tifuwuw/23500301385.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/addition_reaction_of_alkenes_chemguide.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/whatsapp_plus_version_6._88.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/gerisomuxivuxopemak.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/platform_picture_movie_video.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_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 5180 bytes
SHA-256: c5c2d2c70e2edc4c37970413ea9f5f41bb787548e4cf8757ba6a977828a16769
font_01_sfnt_off0000feb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB2 10672 bytes
SHA-256: 51fa18295276fc0b356fe283e78b0ae31de38ae7d64ddb9ff6aab079d43a946c
font_02_sfnt_off000122dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DC 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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