Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d357b1c7fb3a7b…

MALICIOUS

PDF

67.2 KB Created: 2020-12-17 09:06:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97a02f96df01cfec216597eb26e03eed SHA-1: 5d71cb554218ab2e681aab6cad533ce897189271 SHA-256: 19d357b1c7fb3a7b953ff54e8f657416f5ea3a9c2d1b190992b95c331f73462e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, pointing towards an attempt to redirect users to potentially harmful websites.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/strik?utm_term=local+color+definition+in+your+own+words
    • https://cdn-cms.f-static.net/uploads/4454682/normal_5fb9b35c71281.pdf
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/843a2260fbb.pdf
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/4f96ce28bf400d7.pdf
    • https://cdn-cms.f-static.net/uploads/4450502/normal_5fa8fddb3db07.pdf
    • https://cdn-cms.f-static.net/uploads/4412767/normal_5fb4244adee7e.pdf
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/0e3ba8b74095b43.pdf
    • https://cdn-cms.f-static.net/uploads/4450746/normal_5fa1261483ffd.pdf
    • https://cdn-cms.f-static.net/uploads/4413587/normal_5fb6b2d9b9e00.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/werowibovezoje/follow_me_fnaf_song_free.pdf
    • https://s3.amazonaws.com/biwubeleba/lajudiwavezekasoxobibe.pdf
    • https://static1.squarespace.com/static/5fce4b4bccd2b773201ed0e2/t/5fd02a1fef76c20f2d3f0cc5/1607477794419/sazezulewujubupeforota.pdf
    • https://s3.amazonaws.com/tetenifeme/piano_sheet_music_for_hallelujah_by_cloverton.pdf
    • https://static1.squarespace.com/static/5fc384387848ba205d291bb5/t/5fc53896f8cdb769c68d18b6/1606760599872/venogo.pdf
    • https://s3.amazonaws.com/degagaziv/netiga.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_off0000c976.bin
2c9af4d5b82aebbc0e0c0fa9708908abfec74a4852a45d7f6322b43a7f03bc7d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC976 5148 bytes
font_01_sfnt_off0000db28.bin
5716563b583670142efe7a5b34c2486d1c5c8ab9c00944449c548cdcb4b2afe6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 10680 bytes