Malicious PDF — malware analysis report

Static analysis result for SHA-256 9319d6a5e561afc8…

MALICIOUS

PDF

78.0 KB Created: 2021-03-24 05:18:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1ddf40c80fedd340945f6e107bd0b2b SHA-1: eee52238c175dff9d6ae81ff092fdf1d282c2eae SHA-256: 9319d6a5e561afc813fcb70778468ea5ee0ca5652458872c3b0c35f49846739b
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/wix?keyword=learning+tree+school+dallas
    • https://koxewezadopu.weebly.com/uploads/1/3/4/0/134017906/2611397.pdf
    • https://malojedatev.weebly.com/uploads/1/3/0/8/130813840/05988156.pdf
    • http://kunomusofi.22web.org/advanced_air_and_noise_pollution_control.pdf
    • https://vasetovomakoti.weebly.com/uploads/1/3/2/7/132741031/dfc912e4ee71c42.pdf
    • https://vegekonewipure.weebly.com/uploads/1/3/5/9/135964828/jamik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/dudigonifu/molewo.pdf
    • https://s3.amazonaws.com/jenagubadopi/arkitektens_handbok_2018.pdf
    • https://s3.amazonaws.com/zuvovoxigumuz/77054453438.pdf
    • http://jutejuviwolopis.rf.gd/commando_2_full_movie_2013_filmywap.pdf
    • http://komadolosa.rf.gd/66857771058.pdf
    • https://s3.amazonaws.com/gomaxod/ragibesisigesapopo.pdf
    • http://konoxebajokebu.rf.gd/how_do_you_cure_trichotillomania.pdf
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_39ee66fd7ecf4e799487a63f3353b56f.pdf?index=true
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_ed9fe5f96d8448f6835014c24029ad5d.pdf?index=true
    • https://s3.amazonaws.com/sefabe/bobadamanixubim.pdf
    • https://s3.amazonaws.com/nuxomigo/24914124571.pdf
    • http://kudawugijamino.rf.gd/debussy_arabesque_no_1.pdf
    • http://sebedugufafa.rf.gd/2020_champions_tour_schedule.pdf
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_7c5fcf796f7242609ab5ad44d3ba1331.pdf?index=true
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_6594dc4fbee04eedb5ece2f1846edcb0.pdf?index=true
    • https://c779a0a5-5a96-4308-8c37-720837e0bdd2.filesusr.com/ugd/4f1d02_1d90a94b9a074a0880ee09f2f5763c2f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e914.bin
2989b6b917c77f5451d98e8f6c2c88d7cae1719bb350550e438d3bf88e5a30b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE914 4932 bytes
font_01_sfnt_off0000f9c1.bin
e0785fed01cc1558437a064e2aeb8cf1daaa02b9c2fe3f7860ad476cb04a008c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 10148 bytes
font_02_sfnt_off00011c75.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C75 4324 bytes

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