Malicious PDF — malware analysis report

Static analysis result for SHA-256 0377118ec75e3f79…

MALICIOUS

PDF

68.5 KB Created: 2021-02-15 21:50:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48c1c490032dcd64efb74607dfa4ed51 SHA-1: f0962e35103c2a5802898c7fdd9ace331a326368 SHA-256: 0377118ec75e3f79bb20f0c3bab6691b194794f7069f55894c1c36af4af8306b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and a link farm heuristic further supports the conclusion that this document is designed to redirect users to potentially harmful content.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/strik?utm_term=my+brighthouse+remote+not+working
    • https://cdn.sqhk.co/xilasexiki/jhjaChj/tepemipu.pdf
    • https://cdn.sqhk.co/semexixok/Kiejg87/42654682382.pdf
    • http://chebsvet.ru/best_3d_racing_games_for_android_20155jyzj.pdf
    • https://cdn.sqhk.co/xexegapimuwi/5vevuge/fegikolefenemupunuso.pdf
    • https://disaximineta.weebly.com/uploads/1/3/4/8/134883765/1468271.pdf
    • https://static.s123-cdn-static.com/uploads/4393521/normal_5ffe29cd952fa.pdf
    • http://mainsale.info/smash_mouth_all_star_lyrics_in_frenchnumyw.pdf
    • http://autokenn.com/boiler_water_treatment_chemicalswntzx.pdf
    • https://cdn.sqhk.co/fajoliteve/hiaZ4gg/3027354593.pdf
    • http://gaydating.world/lenoxegat1hxt.pdf
    • http://igonlinesupport.com/large_pencil_box_plastic8amoe.pdf
    • http://dreamingdeveloper.com/42011669397wkj4b.pdf
    • http://leaninrzpd.site/76092221743jxrrs.pdf
    • http://shtangye.xyz/134459581283ddux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000d081.bin
2e6a78202a13f7c62c5827a82b77e3d3d1c3f9c6efad703d2bc0bf75c0cf5cc4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD081 5260 bytes
font_01_sfnt_off0000e261.bin
03ba1fd5bbe06d20d5630c46e8ee9d2b69c9e2bfbde4d9d7e1b817a2e4afd35b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 10252 bytes